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claude-code - 💡(How to fix) Fix [BUG] Failed installing claude code desktop app [1 comments, 2 participants]

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anthropics/claude-code#55698•Fetched 2026-05-03 04:46:49
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Error Message

I tried launching the app, got a Another program is currently using this file. consistently so I rebooted, same error. Then uninstalled and am trying to reinstall but keep running into this:

Error Messages/Logs

2026/05/02 21:48:12.034773 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180 2026/05/02 21:48:12.104049 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180 2026/05/02 21:48:12.271505 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180 2026/05/02 21:48:12.287879 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180 2026/05/02 21:50:29.656731 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 2026/05/02 21:50:44.615006 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 2026/05/02 21:51:07.729954 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork. 2026/05/02 21:52:11.748489 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork. 2026/05/02 21:52:21.716453 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180 2026/05/02 21:52:21.999327 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180 2026/05/02 21:53:41.484354 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 2026/05/02 21:54:11.554469 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.

Code Example

2026/05/02 21:48:11.970883 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:48:11.971413 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:48:11.971413 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:48:11.971937 Windows edition: Core
2026/05/02 21:48:11.972454 Windows version: 10.0.26200
2026/05/02 21:48:11.972454 Native arch: x64
2026/05/02 21:48:11.972454 Elevation type: Limited
2026/05/02 21:48:11.972454 Is elevated: false
2026/05/02 21:48:11.972454 Sideloading enabled: true
2026/05/02 21:48:11.972454 S Mode: false
2026/05/02 21:48:11.972454 Conflicting service: false
2026/05/02 21:48:11.972454 Running in non-elevated context
2026/05/02 21:48:11.972454 User can elevate — installing MSIX directly
2026/05/02 21:48:11.988195 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:48:11.988195 System DPI: 96 (scale: 100%)
2026/05/02 21:48:12.024812 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:48:12.025332 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:48:12.034773 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:48:12.051052 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:48:12.051052 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:48:12.051052 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:48:12.052059 Windows edition: Core
2026/05/02 21:48:12.052059 Windows version: 10.0.26200
2026/05/02 21:48:12.052059 Native arch: x64
2026/05/02 21:48:12.052059 Elevation type: Limited
2026/05/02 21:48:12.052059 Is elevated: false
2026/05/02 21:48:12.052059 Sideloading enabled: true
2026/05/02 21:48:12.052059 S Mode: false
2026/05/02 21:48:12.052059 Conflicting service: false
2026/05/02 21:48:12.052059 Running in non-elevated context
2026/05/02 21:48:12.052059 User can elevate — installing MSIX directly
2026/05/02 21:48:12.066195 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:48:12.066195 System DPI: 96 (scale: 100%)
2026/05/02 21:48:12.095661 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:48:12.096176 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:48:12.104049 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:48:12.271505 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:48:12.287879 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:48:23.538405 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:48:33.887337 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:48:37.406692 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:48:43.566445 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:48:52.183596 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:48:52.826855 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:49:03.693667 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:49:05.793341 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:49:15.019094 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:49:28.343902 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:49:31.560210 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:49:38.093988 Download progress: 70% (169655040 / 242355880 bytes)
2026/05/02 21:49:47.841135 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:49:47.956036 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:50:04.071376 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:50:06.699147 Download progress: 70% (169655040 / 242355880 bytes)
2026/05/02 21:50:16.392198 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:50:16.392733 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:50:16.393792 Download complete
2026/05/02 21:50:16.400142 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:50:16.608670 Waiting for elevated process to complete...
2026/05/02 21:50:16.618540 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:50:16.618540 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:50:16.618540 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:50:16.619070 Windows edition: Core
2026/05/02 21:50:16.619070 Windows version: 10.0.26200
2026/05/02 21:50:16.619070 Native arch: x64
2026/05/02 21:50:16.619070 Elevation type: Full
2026/05/02 21:50:16.619070 Is elevated: true
2026/05/02 21:50:16.619070 Sideloading enabled: true
2026/05/02 21:50:16.619070 S Mode: false
2026/05/02 21:50:16.619070 Conflicting service: false
2026/05/02 21:50:16.619070 Running in elevated context
2026/05/02 21:50:16.619590 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix (all-users: false)
2026/05/02 21:50:16.634271 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:50:16.634271 System DPI: 96 (scale: 100%)
2026/05/02 21:50:16.661667 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:50:17.050177 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:50:17.312181 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:50:17.616527 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:50:17.616527 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:50:17.616527 Checking for running Squirrel Claude processes...
2026/05/02 21:50:17.625040 No Squirrel Claude processes found
2026/05/02 21:50:17.625040 Checking for existing Claude MSIX packages...
2026/05/02 21:50:17.642329 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:50:17.643379 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:50:17.643379 Standard install (not split-account), using AddPackage
2026/05/02 21:50:17.643379 Installing via AddPackage (current-user)...
2026/05/02 21:50:25.508077 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:50:29.656731 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:50:29.656731 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:50:31.724384 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:50:31.724893 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:50:31.725931 Download complete
2026/05/02 21:50:31.732152 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:50:31.852517 Waiting for elevated process to complete...
2026/05/02 21:50:31.861583 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:50:31.861583 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:50:31.861583 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:50:31.862111 Windows edition: Core
2026/05/02 21:50:31.862680 Windows version: 10.0.26200
2026/05/02 21:50:31.862680 Native arch: x64
2026/05/02 21:50:31.862680 Elevation type: Full
2026/05/02 21:50:31.862680 Is elevated: true
2026/05/02 21:50:31.862680 Sideloading enabled: true
2026/05/02 21:50:31.862680 S Mode: false
2026/05/02 21:50:31.862680 Conflicting service: false
2026/05/02 21:50:31.862680 Running in elevated context
2026/05/02 21:50:31.862680 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix (all-users: false)
2026/05/02 21:50:31.877241 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:50:31.877241 System DPI: 96 (scale: 100%)
2026/05/02 21:50:31.900756 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:50:32.522658 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:50:32.828512 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:50:32.828512 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:50:32.828512 Checking for running Squirrel Claude processes...
2026/05/02 21:50:32.844244 No Squirrel Claude processes found
2026/05/02 21:50:32.844244 Checking for existing Claude MSIX packages...
2026/05/02 21:50:32.858378 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:50:32.858901 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:50:32.859412 Standard install (not split-account), using AddPackage
2026/05/02 21:50:32.859412 Installing via AddPackage (current-user)...
2026/05/02 21:50:44.615006 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:50:44.615006 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:51:07.729954 Elevated process exited with code 1
2026/05/02 21:51:07.729954 Elevation failed: elevated installer exited with code 1
2026/05/02 21:51:07.729954 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/05/02 21:52:11.747490 Elevated process exited with code 1
2026/05/02 21:52:11.747490 Elevation failed: elevated installer exited with code 1
2026/05/02 21:52:11.748489 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/05/02 21:52:21.660958 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:52:21.660958 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:52:21.660958 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:52:21.660958 Windows edition: Core
2026/05/02 21:52:21.661483 Windows version: 10.0.26200
2026/05/02 21:52:21.661483 Native arch: x64
2026/05/02 21:52:21.661483 Elevation type: Full
2026/05/02 21:52:21.661483 Is elevated: true
2026/05/02 21:52:21.661483 Sideloading enabled: true
2026/05/02 21:52:21.661483 S Mode: false
2026/05/02 21:52:21.661483 Conflicting service: false
2026/05/02 21:52:21.661483 Running in non-elevated context
2026/05/02 21:52:21.661483 User can elevate — installing MSIX directly
2026/05/02 21:52:21.676569 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:52:21.676569 System DPI: 96 (scale: 100%)
2026/05/02 21:52:21.706969 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:52:21.707487 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:52:21.716453 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:52:21.999327 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:52:29.850644 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:52:37.611217 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:52:44.659246 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:52:51.093151 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:52:57.237138 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:53:02.901137 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:53:09.059805 Download progress: 70% (169654464 / 242355880 bytes)
2026/05/02 21:53:15.977579 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:53:22.181621 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:53:28.661506 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:53:28.662125 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:53:28.662660 Download complete
2026/05/02 21:53:28.675784 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:53:28.721254 Waiting for elevated process to complete...
2026/05/02 21:53:28.729599 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:53:28.730118 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:53:28.730118 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:53:28.730118 Windows edition: Core
2026/05/02 21:53:28.730649 Windows version: 10.0.26200
2026/05/02 21:53:28.730649 Native arch: x64
2026/05/02 21:53:28.730649 Elevation type: Full
2026/05/02 21:53:28.730649 Is elevated: true
2026/05/02 21:53:28.730649 Sideloading enabled: true
2026/05/02 21:53:28.730649 S Mode: false
2026/05/02 21:53:28.730649 Conflicting service: false
2026/05/02 21:53:28.730649 Running in elevated context
2026/05/02 21:53:28.730649 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix (all-users: false)
2026/05/02 21:53:28.745917 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:53:28.745917 System DPI: 96 (scale: 100%)
2026/05/02 21:53:28.770239 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:53:29.402827 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:53:29.695098 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:53:29.695098 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:53:29.695098 Checking for running Squirrel Claude processes...
2026/05/02 21:53:29.711902 No Squirrel Claude processes found
2026/05/02 21:53:29.711902 Checking for existing Claude MSIX packages...
2026/05/02 21:53:29.725486 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:53:29.726583 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:53:29.726583 Standard install (not split-account), using AddPackage
2026/05/02 21:53:29.726583 Installing via AddPackage (current-user)...
2026/05/02 21:53:41.484354 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:53:41.484354 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:54:11.554469 Elevated process exited with code 1
2026/05/02 21:54:11.554469 Elevation failed: elevated installer exited with code 1
2026/05/02 21:54:11.554469 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

I tried launching the app, got a Another program is currently using this file. consistently so I rebooted, same error. Then uninstalled and am trying to reinstall but keep running into this: --------------------------- Claude Setup --------------------------- Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.

The log file will be opened in Explorer.

What Should Happen?

The app should install.

Error Messages/Logs

2026/05/02 21:48:11.970883 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:48:11.971413 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:48:11.971413 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:48:11.971937 Windows edition: Core
2026/05/02 21:48:11.972454 Windows version: 10.0.26200
2026/05/02 21:48:11.972454 Native arch: x64
2026/05/02 21:48:11.972454 Elevation type: Limited
2026/05/02 21:48:11.972454 Is elevated: false
2026/05/02 21:48:11.972454 Sideloading enabled: true
2026/05/02 21:48:11.972454 S Mode: false
2026/05/02 21:48:11.972454 Conflicting service: false
2026/05/02 21:48:11.972454 Running in non-elevated context
2026/05/02 21:48:11.972454 User can elevate — installing MSIX directly
2026/05/02 21:48:11.988195 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:48:11.988195 System DPI: 96 (scale: 100%)
2026/05/02 21:48:12.024812 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:48:12.025332 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:48:12.034773 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:48:12.051052 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:48:12.051052 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:48:12.051052 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:48:12.052059 Windows edition: Core
2026/05/02 21:48:12.052059 Windows version: 10.0.26200
2026/05/02 21:48:12.052059 Native arch: x64
2026/05/02 21:48:12.052059 Elevation type: Limited
2026/05/02 21:48:12.052059 Is elevated: false
2026/05/02 21:48:12.052059 Sideloading enabled: true
2026/05/02 21:48:12.052059 S Mode: false
2026/05/02 21:48:12.052059 Conflicting service: false
2026/05/02 21:48:12.052059 Running in non-elevated context
2026/05/02 21:48:12.052059 User can elevate — installing MSIX directly
2026/05/02 21:48:12.066195 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:48:12.066195 System DPI: 96 (scale: 100%)
2026/05/02 21:48:12.095661 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:48:12.096176 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:48:12.104049 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:48:12.271505 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:48:12.287879 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:48:23.538405 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:48:33.887337 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:48:37.406692 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:48:43.566445 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:48:52.183596 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:48:52.826855 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:49:03.693667 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:49:05.793341 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:49:15.019094 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:49:28.343902 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:49:31.560210 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:49:38.093988 Download progress: 70% (169655040 / 242355880 bytes)
2026/05/02 21:49:47.841135 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:49:47.956036 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:50:04.071376 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:50:06.699147 Download progress: 70% (169655040 / 242355880 bytes)
2026/05/02 21:50:16.392198 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:50:16.392733 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:50:16.393792 Download complete
2026/05/02 21:50:16.400142 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:50:16.608670 Waiting for elevated process to complete...
2026/05/02 21:50:16.618540 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:50:16.618540 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:50:16.618540 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:50:16.619070 Windows edition: Core
2026/05/02 21:50:16.619070 Windows version: 10.0.26200
2026/05/02 21:50:16.619070 Native arch: x64
2026/05/02 21:50:16.619070 Elevation type: Full
2026/05/02 21:50:16.619070 Is elevated: true
2026/05/02 21:50:16.619070 Sideloading enabled: true
2026/05/02 21:50:16.619070 S Mode: false
2026/05/02 21:50:16.619070 Conflicting service: false
2026/05/02 21:50:16.619070 Running in elevated context
2026/05/02 21:50:16.619590 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix (all-users: false)
2026/05/02 21:50:16.634271 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:50:16.634271 System DPI: 96 (scale: 100%)
2026/05/02 21:50:16.661667 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:50:17.050177 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:50:17.312181 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:50:17.616527 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:50:17.616527 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:50:17.616527 Checking for running Squirrel Claude processes...
2026/05/02 21:50:17.625040 No Squirrel Claude processes found
2026/05/02 21:50:17.625040 Checking for existing Claude MSIX packages...
2026/05/02 21:50:17.642329 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-3926061710.msix
2026/05/02 21:50:17.643379 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:50:17.643379 Standard install (not split-account), using AddPackage
2026/05/02 21:50:17.643379 Installing via AddPackage (current-user)...
2026/05/02 21:50:25.508077 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:50:29.656731 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:50:29.656731 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:50:31.724384 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:50:31.724893 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:50:31.725931 Download complete
2026/05/02 21:50:31.732152 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:50:31.852517 Waiting for elevated process to complete...
2026/05/02 21:50:31.861583 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:50:31.861583 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:50:31.861583 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:50:31.862111 Windows edition: Core
2026/05/02 21:50:31.862680 Windows version: 10.0.26200
2026/05/02 21:50:31.862680 Native arch: x64
2026/05/02 21:50:31.862680 Elevation type: Full
2026/05/02 21:50:31.862680 Is elevated: true
2026/05/02 21:50:31.862680 Sideloading enabled: true
2026/05/02 21:50:31.862680 S Mode: false
2026/05/02 21:50:31.862680 Conflicting service: false
2026/05/02 21:50:31.862680 Running in elevated context
2026/05/02 21:50:31.862680 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix (all-users: false)
2026/05/02 21:50:31.877241 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:50:31.877241 System DPI: 96 (scale: 100%)
2026/05/02 21:50:31.900756 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:50:32.522658 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:50:32.828512 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:50:32.828512 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:50:32.828512 Checking for running Squirrel Claude processes...
2026/05/02 21:50:32.844244 No Squirrel Claude processes found
2026/05/02 21:50:32.844244 Checking for existing Claude MSIX packages...
2026/05/02 21:50:32.858378 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-2504474781.msix
2026/05/02 21:50:32.858901 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:50:32.859412 Standard install (not split-account), using AddPackage
2026/05/02 21:50:32.859412 Installing via AddPackage (current-user)...
2026/05/02 21:50:44.615006 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:50:44.615006 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:51:07.729954 Elevated process exited with code 1
2026/05/02 21:51:07.729954 Elevation failed: elevated installer exited with code 1
2026/05/02 21:51:07.729954 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/05/02 21:52:11.747490 Elevated process exited with code 1
2026/05/02 21:52:11.747490 Elevation failed: elevated installer exited with code 1
2026/05/02 21:52:11.748489 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
2026/05/02 21:52:21.660958 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:52:21.660958 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:52:21.660958 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:52:21.660958 Windows edition: Core
2026/05/02 21:52:21.661483 Windows version: 10.0.26200
2026/05/02 21:52:21.661483 Native arch: x64
2026/05/02 21:52:21.661483 Elevation type: Full
2026/05/02 21:52:21.661483 Is elevated: true
2026/05/02 21:52:21.661483 Sideloading enabled: true
2026/05/02 21:52:21.661483 S Mode: false
2026/05/02 21:52:21.661483 Conflicting service: false
2026/05/02 21:52:21.661483 Running in non-elevated context
2026/05/02 21:52:21.661483 User can elevate — installing MSIX directly
2026/05/02 21:52:21.676569 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:52:21.676569 System DPI: 96 (scale: 100%)
2026/05/02 21:52:21.706969 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/02 21:52:21.707487 Downloading MSIX to C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:52:21.716453 proxy: WinHttpGetProxyForUrl("https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect"): winapi error #12180
2026/05/02 21:52:21.999327 proxy: WinHttpGetProxyForUrl("https://downloads.claude.ai/releases/win32/x64/1.5354.0/Claude-9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad.msix"): winapi error #12180
2026/05/02 21:52:29.850644 Download progress: 10% (24248144 / 242355880 bytes)
2026/05/02 21:52:37.611217 Download progress: 20% (48496272 / 242355880 bytes)
2026/05/02 21:52:44.659246 Download progress: 30% (72711648 / 242355880 bytes)
2026/05/02 21:52:51.093151 Download progress: 40% (96943392 / 242355880 bytes)
2026/05/02 21:52:57.237138 Download progress: 50% (121191536 / 242355880 bytes)
2026/05/02 21:53:02.901137 Download progress: 60% (145423280 / 242355880 bytes)
2026/05/02 21:53:09.059805 Download progress: 70% (169654464 / 242355880 bytes)
2026/05/02 21:53:15.977579 Download progress: 80% (193886784 / 242355880 bytes)
2026/05/02 21:53:22.181621 Download progress: 90% (218134912 / 242355880 bytes)
2026/05/02 21:53:28.661506 Download progress: 100% (242355880 / 242355880 bytes)
2026/05/02 21:53:28.662125 Download complete: 242355880 bytes, SHA256: 4d38cdb4f097e9e562621f993d77f00286c498ee2b389eeb44d2f49a9f72d404
2026/05/02 21:53:28.662660 Download complete
2026/05/02 21:53:28.675784 Self-elevating: C:\Users\[redacted]\Downloads\Claude Setup(1).exe --elevated --msix-path "C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix" --log-path "C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log"
2026/05/02 21:53:28.721254 Waiting for elevated process to complete...
2026/05/02 21:53:28.729599 Log file: C:\Users\[redacted]\AppData\Local\Temp\ClaudeSetup.log
2026/05/02 21:53:28.730118 === Claude Setup 9a9e3d5a4a368f0f49a80dc303b0ed1a18bfedad started ===
2026/05/02 21:53:28.730118 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/02 21:53:28.730118 Windows edition: Core
2026/05/02 21:53:28.730649 Windows version: 10.0.26200
2026/05/02 21:53:28.730649 Native arch: x64
2026/05/02 21:53:28.730649 Elevation type: Full
2026/05/02 21:53:28.730649 Is elevated: true
2026/05/02 21:53:28.730649 Sideloading enabled: true
2026/05/02 21:53:28.730649 S Mode: false
2026/05/02 21:53:28.730649 Conflicting service: false
2026/05/02 21:53:28.730649 Running in elevated context
2026/05/02 21:53:28.730649 Installing MSIX from C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix (all-users: false)
2026/05/02 21:53:28.745917 Splash: 400x300, 8 frame(s), animated=true
2026/05/02 21:53:28.745917 System DPI: 96 (scale: 100%)
2026/05/02 21:53:28.770239 Verifying Authenticode signature on C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:53:29.402827 WinVerifyTrust: MSIX signature is valid
2026/05/02 21:53:29.695098 Signature verified: MSIX signer matches bootstrapper
2026/05/02 21:53:29.695098 Squirrel process prefix: c:\users\[redacted]\appdata\local\anthropicclaude\
2026/05/02 21:53:29.695098 Checking for running Squirrel Claude processes...
2026/05/02 21:53:29.711902 No Squirrel Claude processes found
2026/05/02 21:53:29.711902 Checking for existing Claude MSIX packages...
2026/05/02 21:53:29.725486 Installing MSIX: C:\Users\[redacted]\AppData\Local\Temp\Claude-557796398.msix
2026/05/02 21:53:29.726583 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/02 21:53:29.726583 Standard install (not split-account), using AddPackage
2026/05/02 21:53:29.726583 Installing via AddPackage (current-user)...
2026/05/02 21:53:41.484354 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/02 21:53:41.484354 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/05/02 21:54:11.554469 Elevated process exited with code 1
2026/05/02 21:54:11.554469 Elevation failed: elevated installer exited with code 1
2026/05/02 21:54:11.554469 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.

Steps to Reproduce

Run the installer.

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

latest installer

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

No response

extent analysis

TL;DR

The installation of Claude Code fails with an HRESULT 0x80073CF6 error, indicating a potential issue with the MSIX package installation.

Guidance

  • Check the system's event logs for any errors related to MSIX package installation to gather more information about the failure.
  • Ensure that the user account has the necessary permissions to install MSIX packages, as the error message suggests that administrator access is required.
  • Try installing the MSIX package manually using the Windows Package Manager or PowerShell to see if the issue is specific to the Claude Code installer.
  • Verify that the MSIX package is correctly signed and validated, as the log indicates a successful signature verification.

Example

No code example is provided, as the issue is related to the installation process rather than a specific code snippet.

Notes

The provided log file indicates multiple attempts to install the MSIX package, all of which fail with the same HRESULT 0x80073CF6 error. The error message suggests that administrator access is required to install Claude with full features.

Recommendation

Apply workaround: Try installing the MSIX package manually or running the installer with elevated privileges to see if the issue is resolved. If the issue persists, it may be necessary to investigate further to determine the root cause of the installation failure.

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