I’d like to share the latest update from Microsoft regarding the installation and repair issue:
Background on the Issue
The issue originates from changes introduced by Microsoft’s September 2024 Security Updates (KB5042880 and KB5043055). These updates modified how Windows Installer handles application repairs, now requiring elevation via UAC prompts even for per-user MSI repairs.
To restore previous behavior, Microsoft recommends setting the following registry key:
This workaround disables the new UAC enforcement during repair operations, allowing impacted machines to function as expected.
Background & Next Steps
Microsoft’s R&D team is actively investigating the root cause and working on a permanent fix. Here’s what you can expect:
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Patch Release: A permanent fix will be published through Microsoft’s official update channels.
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Customer Notification: All licensed users will receive an email notification detailing the resolution and deployment instructions.
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Public Documentation: Microsoft will publish full details on its support and community platforms.
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Preventive Guidance: Recommendations will be shared to help avoid similar issues in future releases.
Current Workarounds
While Microsoft finalizes the fix, there are three available workarounds:
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Disable UAC for MSI repair operations – by setting the registry key above. This only impacts the MSI repair process and does not reduce the overall Windows system security level.
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Uninstall the September security updates – although please note that automatic updates may reinstall them.
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Grant administrator credentials when prompted – some users have confirmed that once credentials are entered, the issue does not reoccur.
We will continue to monitor Microsoft’s progress and keep you updated as soon as the permanent fix is released.