How to Fix Fix Error 0x80070660 — Windows Installer Version Mismatch on Windows
Getting error 0x80070660 during software installation? "The installation source for this product is not available"? Installer version conflict? Fix this MSI installation error.
Symptoms
You might be experiencing this problem if you notice:
- •Software installation fails with error 0x80070660
- •Windows Update fails for certain MSI-based updates
- •Program repair or uninstall throws this error
- •Office or Visual Studio update fails with version mismatch
- •"Installation source not available" during update
- •Administrative install point or network install path broken
Common Causes
- ⚠Original installation media or network path no longer available
- ⚠Windows Installer cache missing the original MSI
- ⚠Installer trying to access a removed or moved installation source
- ⚠Product registered with wrong source path in registry
- ⚠MSI repair attempted but install source path changed
- ⚠Group Policy software installation source path stale
Solutions
Solution 1: Fix Installation Source Path
- 1If the error names a specific product:
- 2Try downloading the latest full installer for that product
- 3Run the full installer — it should detect existing install and repair
- 4For Microsoft Office: download Office Deployment Tool
- 5Run: setup.exe /configure configuration.xml
- 6For other software: check vendor website for latest installer
- 7If upgrading: install the newer version over the old one
- 8The new installer provides its own source files
Solution 2: Repair Windows Installer Registration
- 1CMD as Admin:
- 2msiexec /unregister
- 3msiexec /regserver
- 4Clear stale installer cache entries:
- 5Do NOT delete C:\Windows\Installer files manually
- 6Instead: use MSIZAP tool (from Windows SDK) to clean specific products
- 7Or: use Microsoft Program Install/Uninstall Troubleshooter
- 8Download from: support.microsoft.com/en-us/topic/fix-problems-that-block-programs-from-being-installed-or-removed
- 9This safely cleans registry entries for broken installations
Solution 3: Clean Install the Affected Software
- 1If repair and update both fail:
- 2Uninstall the program completely:
- 3Settings → Apps → find the program → Uninstall
- 4If uninstall also fails: use the Microsoft troubleshooter from previous step
- 5After removal: clean up leftover files:
- 6Delete program folder from C:\Program Files or C:\Program Files (x86)
- 7Restart PC
- 8Download fresh installer from vendor
- 9Install from scratch → update to latest version
- 10sfc /scannow if system updates are affected
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