Windows: App unusable after update — file lock + spawn EBUSY (v1.3561.0.0)[BUG]
Preflight Checklist
- [x] I have searched existing issues and this hasn't been reported yet
- [x] This is a single bug report (please file separate reports for different bugs)
- [x] I am using the latest version of Claude Code
What's Wrong?
Clicked "Update" in Claude Desktop on Windows 11. App closed and
never launched again — "File is in use by another program" error
at C:\Program Files\WindowsApps\Claude_1.3561.0.0_x64__pzs8sxrjxfjjc.
CoworkVMService locks package files. Set-Service and sc.exe return
"Access Denied" even with admin rights. Had to disable service
via registry (HKLM Start=4).
After full reinstall (Remove-AppxPackage + reinstall), sending
messages fails with "spawn EBUSY". 9+ claude.exe processes pile up
every send attempt.
Spent 2+ hours middle of the night fixing this. Script crashed due
to forced reboot. App still doesn't work. Paid Max subscription.
Version: 1.3561.0.0
OS: Windows 11
Install: MSIX / Microsoft Store
What Should Happen?
The paid app have to start working
Error Messages/Logs
Steps to Reproduce
Clicked "Update" in Claude Desktop on Windows 11. App closed and
never launched again — "File is in use by another program" error
at C:\Program Files\WindowsApps\Claude_1.3561.0.0_x64__pzs8sxrjxfjjc.
CoworkVMService locks package files. Set-Service and sc.exe return
"Access Denied" even with admin rights. Had to disable service
via registry (HKLM Start=4).
After full reinstall (Remove-AppxPackage + reinstall), sending
messages fails with "spawn EBUSY". 9+ claude.exe processes pile up
every send attempt.
Spent 2+ hours middle of the night fixing this. Script crashed due
to forced reboot. App still doesn't work. Paid Max subscription.
Version: 1.3561.0.0
OS: Windows 11
Install: MSIX / Microsoft Store
Claude Model
None
Is this a regression?
Yes, this worked in a previous version
Last Working Version
_No response_
Claude Code Version
N/A — Desktop App issue, not CLI
Platform
Anthropic API
Operating System
Windows
Terminal/Shell
Windows Terminal
Additional Information
_No response_
3 Comments
Same problem.
Version: 1.3561.0.0
OS: Windows 11
This is definitely not "invalid." I was able to reinstall an older version with...
winget install -e --id Anthropic.Claude --version 1.3109.0...but lost all my memories, scheduled tasks, history, etc. Also, cowork was no longer available. Fortunately my actual work files are on a separate drive.
Tried to update again to (1.3561.0.0) to regain cowork access but received same error. Full log below (and yes, I installed with administrator permissions).
2026/04/20 17:15:04.670956 === Claude Setup started ===
2026/04/20 17:15:04.672546 AllowAllTrustedApps not found (sideloading assumed enabled): The system cannot find the file specified.
2026/04/20 17:15:04.673070 Windows edition: Professional
2026/04/20 17:15:04.673597 Windows version: 10.0.26200
2026/04/20 17:15:04.673597 Native arch: x64
2026/04/20 17:15:04.673597 Elevation type: Full
2026/04/20 17:15:04.673597 Is elevated: true
2026/04/20 17:15:04.673597 Sideloading enabled: true
2026/04/20 17:15:04.673597 S Mode: false
2026/04/20 17:15:04.673597 Conflicting service: false
2026/04/20 17:15:04.673597 Running in elevated context
2026/04/20 17:15:04.673597 Installing MSIX from C:\Users\mike\AppData\Local\Temp\Claude-1870125076.msix (all-users: false)
2026/04/20 17:15:04.706283 Splash: 400x300, 8 frame(s), animated=true
2026/04/20 17:15:04.707281 System DPI: 144 (scale: 150%)
2026/04/20 17:15:04.829473 Verifying Authenticode signature on C:\Users\mike\AppData\Local\Temp\Claude-1870125076.msix
2026/04/20 17:15:05.854529 WinVerifyTrust: MSIX signature is valid
2026/04/20 17:15:06.149267 Signature verified: MSIX signer matches bootstrapper
2026/04/20 17:15:06.149267 Squirrel process prefix: c:\users\mike\appdata\local\anthropicclaude\
2026/04/20 17:15:06.149267 Checking for running Squirrel Claude processes...
2026/04/20 17:15:06.156828 No Squirrel Claude processes found
2026/04/20 17:15:06.156828 Checking for existing Claude MSIX packages...
2026/04/20 17:15:06.254235 Installing MSIX: C:\Users\mike\AppData\Local\Temp\Claude-1870125076.msix
2026/04/20 17:15:06.255883 Extracted family name from MSIX manifest: Claude_pzs8sxrjxfjjc
2026/04/20 17:15:06.255883 Standard install (not split-account), using AddPackage
2026/04/20 17:15:06.255883 Installing via AddPackage (current-user)...
2026/04/20 17:15:19.275273 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/04/20 17:15:19.275273 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
Please share this log with us.
2026/04/20 17:15:23.725738 Elevated process exited with code 1
2026/04/20 17:15:23.726268 Elevation failed: elevated installer exited with code 1
2026/04/20 17:15:23.726268 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.
Fixed with version 1.3561.0 (fbc74b)
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.