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claude-code - 💡(How to fix) Fix [BUG] Cowork "yukonSilver not supported" on Windows 11 Business — persists after full clean reinstall [2 comments, 2 participants]

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anthropics/claude-code#55106•Fetched 2026-05-01 05:46:07
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Error Message

Error Messages/Logs

Code Example

From %APPDATA%\Claude\logs\cowork_vm_node.log:

2026-04-30 18:24:08 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...

This is the entire log — the VM never progresses past this check.
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?

Cowork shows a "Reinstall the desktop app to access Cowork" banner. Clicking the Reinstall button does nothing. After manually downloading and reinstalling from claude.ai/download, the banner persists. The log confirms the VM never attempts to start.

What Should Happen?

Cowork should detect Windows 11 Business as a supported platform and start the VM workspace.

Error Messages/Logs

From %APPDATA%\Claude\logs\cowork_vm_node.log:

2026-04-30 18:24:08 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...

This is the entire log — the VM never progresses past this check.

Steps to Reproduce

  1. Download and install Claude Desktop MSIX from claude.ai/download as Administrator
  2. Open Claude Desktop and click the Cowork tab
  3. Observe "Reinstall the desktop app to access Cowork" banner

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

Claude Code not installed

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Regular Claude chat works perfectly. The issue is isolated to Cowork. This appears to be the same faulty platform detection reported in #25136, #32004, #47327 and others.

Troubleshooting Already Attempted

  • Full uninstall + deletion of %APPDATA%\Claude and %LOCALAPPDATA%\Claude
  • Fresh reinstall from claude.ai/download, run as Administrator
  • Ran Get-AppxPackage -Name "Claude" | Remove-AppxPackage in PowerShell as Administrator before reinstalling
  • Confirmed Virtual Machine Platform: Enabled
  • Confirmed Hyper-V: Enabled

extent analysis

TL;DR

The issue is likely due to faulty platform detection, and a potential workaround is to investigate and potentially modify the platform detection logic in the Claude Code.

Guidance

  • Investigate the cleanupVMBundleIfUnsupported function to understand why it's marking the platform as unsupported, and verify if Windows 11 Business is correctly listed as a supported platform.
  • Review the issues mentioned in the "Additional Information" section (#25136, #32004, #47327) to see if they provide any insight into the platform detection issue.
  • Check the documentation for the Anthropic API to ensure that the correct platform detection parameters are being passed.
  • Consider testing the Cowork feature on a different platform to isolate if the issue is specific to Windows 11 Business.

Example

No code snippet is provided as the issue does not include specific code details.

Notes

The issue seems to be related to a known problem with platform detection, but without more information about the cleanupVMBundleIfUnsupported function or the Anthropic API, it's difficult to provide a definitive solution.

Recommendation

Apply workaround: The user should investigate the platform detection logic and potentially modify it to correctly identify Windows 11 Business as a supported platform, as the issue seems to be related to a known problem with platform detection.

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claude-code - 💡(How to fix) Fix [BUG] Cowork "yukonSilver not supported" on Windows 11 Business — persists after full clean reinstall [2 comments, 2 participants]