Claude Desktop installation fails with HRESULT 0x80073CF6 on Windows 11 Pro

[shoumyasrkr91]

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?

System:

• Windows 11 Pro, Build 26200
• Intel i5-14600K, 48GB RAM
• x64-based PC, Gigabyte Z790 Eagle AX

Problem:
Installation fails at the MSIX package registration step with error:
"AddPackage failed with HRESULT 0x80073CF6"

Steps taken:

1. Removed old Claude package via Get-AppxPackage claude | Remove-AppxPackage
2. Deleted all leftover Claude folders from LocalAppData
3. Confirmed CoworkVMService does not exist
4. Restarted PC
5. Downloaded fresh installer from claude.com/download
6. Ran as Administrator
7. Same error persists every time

Expected: Claude Desktop installs successfully
Actual: Installation fails with HRESULT 0x80073CF6

What Should Happen?

Claude Desktop should install successfully on Windows 11 Pro

Error Messages/Logs

Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Steps to Reproduce

1. Download ClaudeSetup.exe from claude.com/download
2. Run as Administrator on Windows 11 Pro Build 26200
3. Installation fails with HRESULT 0x80073CF6

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude.ai

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Attempted full cleanup via PowerShell before reinstalling:

• Get-AppxPackage claude | Remove-AppxPackage (ran successfully)
• Deleted LocalAppData Claude folders
• CoworkVMService confirmed not present
• Fresh installer downloaded, same error persists

[0xbrainkid]

HRESULT 0x80073CF6 is ERROR_PACKAGES_IN_USE — the MSIX installer is trying to update or register a package that Windows considers currently in use, which blocks the operation.

This happens on Windows 11 when a previous Claude Desktop install (or a partial install) left registry entries or package artifacts that the new installer sees as an active installation, even if there's no visible app.

Resolution steps:

1. Remove stale package registration:
   Open PowerShell as Administrator and run:

   Get-AppxPackage *Claude* | Remove-AppxPackage

   Then also check for provisioned packages:

   Get-AppxProvisionedPackage -Online | Where-Object {/bin/bash.PackageName -like '*Claude*'} | Remove-AppxProvisionedPackage -Online

2. Clear MSIX deployment cache:

   # Stop Windows Update and AppX services
   net stop wuauserv
   net stop AppXSvc
   # Clear staging folder (safe to delete contents, not the folder itself)
   Remove-Item 'C:\Windows\SoftwareDistribution\Download\*' -Recurse -Force
   net start AppXSvc
   net start wuauserv

3. Retry the install from a clean state:
   After removing the stale package, re-download the installer fresh (don't reuse the cached .exe) and run as Administrator.

4. If steps 1-3 fail — check Event Viewer:
   Open Event Viewer → Windows Logs → Application, filter by Source = MsiInstaller or AppXDeployment-Server. The detailed error there will show exactly which package file the deployment service is blocking on.

The 0x80073CF6 error is always a stale-registration issue on modern Windows 11, not a hardware compatibility issue — your i5-14600K and 48GB RAM are well above requirements.

[ARHAEEM]

Hey i just did a workaround and it worked, hope it helps: #49917 (comment)

[github-actions]

Closing for now — inactive for too long. Please open a new issue if this is still relevant.

[github-actions]

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.