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claude-code - 💡(How to fix) Fix Claude Desktop install fails on Windows 11 — AddPackage HRESULT 0x80073CF6

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The Claude Desktop installer for Windows fails during MSIX registration. The download completes and the Authenticode signature verifies fine, but AddPackage fails with HRESULT 0x80073CF6 ("the package could not be registered"). It fails identically on retry, both in the elevated and non-elevated paths.

Error Message

ERROR dialog: Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 ERROR dialog: Administrator access is required to install Claude with full features. You can try again or install without Cowork. 2026/05/15 13:19:52.809972 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6 2026/05/15 13:21:07.488453 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork. 2026/05/15 13:21:39.699866 ERROR dialog: Administrator access is required to install Claude with full features. You can try again or install without Cowork.

Root Cause

The Claude Desktop installer for Windows fails during MSIX registration. The download completes and the Authenticode signature verifies fine, but AddPackage fails with HRESULT 0x80073CF6 ("the package could not be registered"). It fails identically on retry, both in the elevated and non-elevated paths.

Code Example

MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
ERROR dialog: Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
Elevated process exited with code 1
ERROR dialog: Administrator access is required to install Claude with full features. You can try again or install without Cowork.

---

2026/05/15 13:19:36.443533 Log file: C:\Users\pinyv\AppData\Local\Temp\ClaudeSetup.log
2026/05/15 13:19:36.444044 === Claude Setup 2dbd7802ab037cbb97d77be1a063241009b5e598 started ===
2026/05/15 13:19:36.444555 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/15 13:19:36.445064 Windows edition: Professional
2026/05/15 13:19:36.445574 Windows version: 10.0.26200
2026/05/15 13:19:36.445574 Native arch: x64
2026/05/15 13:19:36.445574 Elevation type: Limited
2026/05/15 13:19:36.445574 Is elevated: false
2026/05/15 13:19:36.445574 Sideloading enabled: true
2026/05/15 13:19:36.445574 S Mode: false
2026/05/15 13:19:36.445574 Conflicting service: false
2026/05/15 13:19:36.445574 Running in non-elevated context
2026/05/15 13:19:36.445574 User can elevate — installing MSIX directly
2026/05/15 13:19:36.489942 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/15 13:19:36.490463 Downloading MSIX to C:\Users\pinyv\AppData\Local\Temp\Claude-3881463504.msix
2026/05/15 13:19:38.821665 Download complete: 234482934 bytes, SHA256: fe07f6ecfec343a4132ce5898414ee5a3156464aeb3dbefb10adda23abf77b5e
2026/05/15 13:19:38.844716 Self-elevating: --elevated --msix-path "...Claude-3881463504.msix"
2026/05/15 13:19:41.054516 Elevation type: Full / Is elevated: true / Running in elevated context
2026/05/15 13:19:41.099548 Verifying Authenticode signature on Claude-3881463504.msix
2026/05/15 13:19:41.733439 WinVerifyTrust: MSIX signature is valid
2026/05/15 13:19:42.030566 Signature verified: MSIX signer matches bootstrapper
2026/05/15 13:19:42.038342 No Squirrel Claude processes found
2026/05/15 13:19:42.052830 Installing MSIX: Claude-3881463504.msix
2026/05/15 13:19:42.054378 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/15 13:19:42.054378 Standard install (not split-account), using AddPackage
2026/05/15 13:19:42.054378 Installing via AddPackage (current-user)...
2026/05/15 13:19:52.809972 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/15 13:19:52.809972 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/15 13:21:07.488453 Elevated process exited with code 1
2026/05/15 13:21:07.488453 Elevation failed: elevated installer exited with code 1
2026/05/15 13:21:07.488453 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.

--- Retry (same result) ---
2026/05/15 13:21:24 === Claude Setup started === (build 2dbd7802ab037cbb97d77be1a063241009b5e598)
2026/05/15 13:21:26.786193 Download complete: 234482934 bytes, SHA256: fe07f6ecfec343a4132ce5898414ee5a3156464aeb3dbefb10adda23abf77b5e
2026/05/15 13:21:27.509321 WinVerifyTrust: MSIX signature is valid
2026/05/15 13:21:27.802548 Signature verified: MSIX signer matches bootstrapper
2026/05/15 13:21:27.828861 Installing via AddPackage (current-user)...
2026/05/15 13:21:37.848629 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/15 13:21:39.699866 Elevated process exited with code 1
2026/05/15 13:21:39.699866 ERROR dialog: Administrator access is required to install Claude with full features. You can try again or install without Cowork.
RAW_BUFFERClick to expand / collapse

Summary

The Claude Desktop installer for Windows fails during MSIX registration. The download completes and the Authenticode signature verifies fine, but AddPackage fails with HRESULT 0x80073CF6 ("the package could not be registered"). It fails identically on retry, both in the elevated and non-elevated paths.

Environment

  • Windows edition: Professional
  • Windows version: 10.0.26200 (Windows 11)
  • Native arch: x64
  • Sideloading enabled: true · S Mode: false
  • Installer build: 2dbd7802ab037cbb97d77be1a063241009b5e598
  • App version: 1.7196.0
  • MSIX family name: Claude_pzs8sxrjxfjjc

Steps to reproduce

  1. Run Claude Setup.exe.
  2. Installer downloads the MSIX (234 MB, SHA256 fe07f6ec…b77b5e) successfully.
  3. Signature verifies OK.
  4. Installing via AddPackage (current-user)... → fails ~10 s later.

Expected

Claude Desktop installs successfully.

Actual

MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
ERROR dialog: Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
Elevated process exited with code 1
ERROR dialog: Administrator access is required to install Claude with full features. You can try again or install without Cowork.

Full installer log

2026/05/15 13:19:36.443533 Log file: C:\Users\pinyv\AppData\Local\Temp\ClaudeSetup.log
2026/05/15 13:19:36.444044 === Claude Setup 2dbd7802ab037cbb97d77be1a063241009b5e598 started ===
2026/05/15 13:19:36.444555 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/05/15 13:19:36.445064 Windows edition: Professional
2026/05/15 13:19:36.445574 Windows version: 10.0.26200
2026/05/15 13:19:36.445574 Native arch: x64
2026/05/15 13:19:36.445574 Elevation type: Limited
2026/05/15 13:19:36.445574 Is elevated: false
2026/05/15 13:19:36.445574 Sideloading enabled: true
2026/05/15 13:19:36.445574 S Mode: false
2026/05/15 13:19:36.445574 Conflicting service: false
2026/05/15 13:19:36.445574 Running in non-elevated context
2026/05/15 13:19:36.445574 User can elevate — installing MSIX directly
2026/05/15 13:19:36.489942 MSIX URL: https://api.anthropic.com/api/desktop/win32/x64/msix/latest/redirect
2026/05/15 13:19:36.490463 Downloading MSIX to C:\Users\pinyv\AppData\Local\Temp\Claude-3881463504.msix
2026/05/15 13:19:38.821665 Download complete: 234482934 bytes, SHA256: fe07f6ecfec343a4132ce5898414ee5a3156464aeb3dbefb10adda23abf77b5e
2026/05/15 13:19:38.844716 Self-elevating: --elevated --msix-path "...Claude-3881463504.msix"
2026/05/15 13:19:41.054516 Elevation type: Full / Is elevated: true / Running in elevated context
2026/05/15 13:19:41.099548 Verifying Authenticode signature on Claude-3881463504.msix
2026/05/15 13:19:41.733439 WinVerifyTrust: MSIX signature is valid
2026/05/15 13:19:42.030566 Signature verified: MSIX signer matches bootstrapper
2026/05/15 13:19:42.038342 No Squirrel Claude processes found
2026/05/15 13:19:42.052830 Installing MSIX: Claude-3881463504.msix
2026/05/15 13:19:42.054378 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/05/15 13:19:42.054378 Standard install (not split-account), using AddPackage
2026/05/15 13:19:42.054378 Installing via AddPackage (current-user)...
2026/05/15 13:19:52.809972 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/15 13:19:52.809972 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/15 13:21:07.488453 Elevated process exited with code 1
2026/05/15 13:21:07.488453 Elevation failed: elevated installer exited with code 1
2026/05/15 13:21:07.488453 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.

--- Retry (same result) ---
2026/05/15 13:21:24 === Claude Setup started === (build 2dbd7802ab037cbb97d77be1a063241009b5e598)
2026/05/15 13:21:26.786193 Download complete: 234482934 bytes, SHA256: fe07f6ecfec343a4132ce5898414ee5a3156464aeb3dbefb10adda23abf77b5e
2026/05/15 13:21:27.509321 WinVerifyTrust: MSIX signature is valid
2026/05/15 13:21:27.802548 Signature verified: MSIX signer matches bootstrapper
2026/05/15 13:21:27.828861 Installing via AddPackage (current-user)...
2026/05/15 13:21:37.848629 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/05/15 13:21:39.699866 Elevated process exited with code 1
2026/05/15 13:21:39.699866 ERROR dialog: Administrator access is required to install Claude with full features. You can try again or install without Cowork.

Notes

  • 0x80073CF6 = ERROR_PACKAGE_REGISTRATION_FAILED. Common causes: a leftover/corrupted prior registration of the same package family, the AppX deployment service being disabled, or per-user package state corruption.
  • The log shows No Squirrel Claude processes found and the installer reports it is doing a standard (not split-account) install, so this does not appear to be a "previous version still running" case.

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claude-code - 💡(How to fix) Fix Claude Desktop install fails on Windows 11 — AddPackage HRESULT 0x80073CF6