[BUG] Windows MSIX Installation Fails with Error 0x80073CF6 - File Download Issues

[m65-hippo]

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?

Issue: Claude Desktop (MSIX) Installation Fails on Windows with Error 0x80073CF6

Environment:
Windows (Version 25H2, OS Build 26200.8655)
PowerShell running as Administrator
Claude.msix download from https://claude.ai/download

Problem:
Unable to install Claude Desktop application. Multiple installation attempts have failed with the following issues:

• Initial MSIX Installation Error: Error code 0x80073CF6 when attempting to install Claude.msix
• DISM Repair Attempted: Ran DISM commands to repair Windows component store, but installation still fails
• Download Issues: Claude.msix file does not appear in Downloads folder after clicking download button from https://claude.ai/download (attempted 4+ times)
• PowerShell Path Error: When attempting manual installation via Add-AppxPackage -Path "Claude.msix", receives error "Cannot find path 'C:\windows\system32\Claude.msix' because it does not exist"
• File Not Found: After navigating to Downloads folder and running ls Claude.msix, file does not exist despite multiple download attempts

Steps Already Tried:

• Downloaded from https://claude.ai/download multiple times
• Ran PowerShell as Administrator
• Attempted DISM repair commands
• Tried direct download links
• Attempted installation from different directories
• Checked Downloads folder - file never appears

Current Status:

• Claude Code Terminal version is installed and working
• Desktop MSIX installation completely blocked
• Download may be failing silently or Windows MSIX deployment system has persistent issues

What Should Happen?

Expected Behavior:

• Claude.msix should download successfully and install without errors

Actual Behavior:

• File doesn't download or installation fails with 0x80073CF6 error

Error Messages/Logs

Log Name:      Application
Source:        Windows Error Reporting
Date:          6/10/2026 8:43:58 PM
Event ID:      1001
Task Category: None
Level:         Information
Keywords:      
User:          SYSTEM
Computer:      Gudrun
Description:
Fault bucket , type 0
Event Name: crashpad_log
Response: Not available
Cab Id: 0

Problem signature:
P1: setup.exe
P2: 149.0.4022.62
P3: EdgeInstallerError|msedge
P4: 0x21f
P5: 
P6: 
P7: 
P8: 
P9: 
P10: 

Attached files:
\\?\C:\Windows\SystemTemp\msedge_installer.log

These files may be available here:
NULL

Analysis symbol: 
Rechecking for solution: 0
Report Id: 377841fb-b53a-408e-96d5-5596d5adb7d6
Report Status: 268697600
Hashed bucket: 
Cab Guid: 0
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Windows Error Reporting" Guid="{0ead09bd-2157-539a-8d6d-c87f95b64d70}" />
    <EventID>1001</EventID>
    <Version>0</Version>
    <Level>4</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2026-06-11T01:43:58.3163954Z" />
    <EventRecordID>54245</EventRecordID>
    <Correlation ActivityID="{dfe9c0f3-f93f-0002-6681-eddf3ff9dc01}" />
    <Execution ProcessID="29836" ThreadID="29840" />
    <Channel>Application</Channel>
    <Computer>Gudrun</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="Bucket">
    </Data>
    <Data Name="BucketType">0</Data>
    <Data Name="EventName">crashpad_log</Data>
    <Data Name="Response">Not available</Data>
    <Data Name="CabId">0</Data>
    <Data Name="P1">setup.exe</Data>
    <Data Name="P2">149.0.4022.62</Data>
    <Data Name="P3">EdgeInstallerError|msedge</Data>
    <Data Name="P4">0x21f</Data>
    <Data Name="P5">
    </Data>
    <Data Name="P6">
    </Data>
    <Data Name="P7">
    </Data>
    <Data Name="P8">
    </Data>
    <Data Name="P9">
    </Data>
    <Data Name="P10">
    </Data>
    <Data Name="AttachedFiles">
\\?\C:\Windows\SystemTemp\msedge_installer.log</Data>
    <Data Name="StorePath">NULL</Data>
    <Data Name="AnalysisSymbol">
    </Data>
    <Data Name="Rechecking">0</Data>
    <Data Name="ReportId">377841fb-b53a-408e-96d5-5596d5adb7d6</Data>
    <Data Name="ReportStatus">268697600</Data>
    <Data Name="HashedBucket">
    </Data>
    <Data Name="CabGuid">0</Data>
  </EventData>
</Event>


Log Name:      Application
Source:        Windows Error Reporting
Date:          6/10/2026 8:43:58 PM
Event ID:      1001
Task Category: None
Level:         Information
Keywords:      
User:          SYSTEM
Computer:      Gudrun
Description:
Fault bucket 2210342864552269507, type 5
Event Name: crashpad_log
Response: Not available
Cab Id: 0

Problem signature:
P1: setup.exe
P2: 149.0.4022.62
P3: EdgeInstallerError|msedge
P4: 0x21f
P5: 
P6: 
P7: 
P8: 
P9: 
P10: 

Attached files:
\\?\C:\Windows\SystemTemp\msedge_installer.log
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.44c3bcd3-899c-4f8d-b636-6b39900bbd6c.tmp.WERInternalMetadata.xml
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.51533ff3-1d77-4524-8306-0caed6d9baf0.tmp.csv
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f5c9fe5f-0e9f-4b8e-bb7d-c666b86d17f8.tmp.txt
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.500fbf39-ef35-429d-bd90-c471f8d7d2bb.tmp.xml

These files may be available here:
\\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\NonCritical_setup.exe_dbb8fd12a8c7a1f282fa637741f9cba2a2e3d8_00000000_377841fb-b53a-408e-96d5-5596d5adb7d6

Analysis symbol: 
Rechecking for solution: 0
Report Id: 377841fb-b53a-408e-96d5-5596d5adb7d6
Report Status: 268435456
Hashed bucket: f71a964782c685d5feacb71fd97516c3
Cab Guid: 0
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Windows Error Reporting" Guid="{0ead09bd-2157-539a-8d6d-c87f95b64d70}" />
    <EventID>1001</EventID>
    <Version>0</Version>
    <Level>4</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x8000000000000000</Keywords>
    <TimeCreated SystemTime="2026-06-11T01:43:58.3082383Z" />
    <EventRecordID>54244</EventRecordID>
    <Correlation />
    <Execution ProcessID="22588" ThreadID="6184" />
    <Channel>Application</Channel>
    <Computer>Gudrun</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="Bucket">2210342864552269507</Data>
    <Data Name="BucketType">5</Data>
    <Data Name="EventName">crashpad_log</Data>
    <Data Name="Response">Not available</Data>
    <Data Name="CabId">0</Data>
    <Data Name="P1">setup.exe</Data>
    <Data Name="P2">149.0.4022.62</Data>
    <Data Name="P3">EdgeInstallerError|msedge</Data>
    <Data Name="P4">0x21f</Data>
    <Data Name="P5">
    </Data>
    <Data Name="P6">
    </Data>
    <Data Name="P7">
    </Data>
    <Data Name="P8">
    </Data>
    <Data Name="P9">
    </Data>
    <Data Name="P10">
    </Data>
    <Data Name="AttachedFiles">
\\?\C:\Windows\SystemTemp\msedge_installer.log
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.44c3bcd3-899c-4f8d-b636-6b39900bbd6c.tmp.WERInternalMetadata.xml
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.51533ff3-1d77-4524-8306-0caed6d9baf0.tmp.csv
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.f5c9fe5f-0e9f-4b8e-bb7d-c666b86d17f8.tmp.txt
\\?\C:\ProgramData\Microsoft\Windows\WER\Temp\WER.500fbf39-ef35-429d-bd90-c471f8d7d2bb.tmp.xml</Data>
    <Data Name="StorePath">\\?\C:\ProgramData\Microsoft\Windows\WER\ReportArchive\NonCritical_setup.exe_dbb8fd12a8c7a1f282fa637741f9cba2a2e3d8_00000000_377841fb-b53a-408e-96d5-5596d5adb7d6</Data>
    <Data Name="AnalysisSymbol">
    </Data>
    <Data Name="Rechecking">0</Data>
    <Data Name="ReportId">377841fb-b53a-408e-96d5-5596d5adb7d6</Data>
    <Data Name="ReportStatus">268435456</Data>
    <Data Name="HashedBucket">f71a964782c685d5feacb71fd97516c3</Data>
    <Data Name="CabGuid">0</Data>
  </EventData>
</Event>

Steps to Reproduce

These occur when downloading the Windows Desktop version.

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.1.170 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

No response

[Amitj13]

Same issue for me:

2026/06/12 19:53:01.449022 Installing via AddPackage (current-user)...
2026/06/12 19:53:14.973649 MSIX installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6
2026/06/12 19:53:14.973649 ERROR dialog (opening log): Installation failed: AddPackage failed: AddPackage failed with HRESULT 0x80073CF6

Please share this log with us.
2026/06/12 19:53:18.470236 Elevated process exited with code 1
2026/06/12 19:53:18.470236 Elevation failed: elevated installer exited with code 1
2026/06/12 19:53:18.470236 ERROR dialog (with log path): Administrator access is required to install Claude with full features. You can try again or install without Cowork.

[WikiKhowaja]

Hitting the same AddPa

ClaudeSetup.log

ckage HRESULT 0x80073CF6 on Windows. Installer downloads/verifies fine, then fails at MSIX registration. Get-AppxPackage and DISM find nothing to remove, but AddPackage is still rejected — package appears wedged. Tried: reboot, Get-AppxPackage -AllUsers removal, wsreset, DISM. None cleared it. Win build: [run winver, paste here]. Log attached.

[ByteJuggler]

I have a similar-ish problem, though different error code and some differences here.