You can check the Official Support Page for the latest troubleshooting advice.
As of 2025, Microsoft has officially retired this standalone tool and removed it from their main download pages, recommending that users use the built-in troubleshooters in Windows Settings instead. Where to Find the Troubleshooter Download Microsoft Program Install and Uninstall meta rar
If the built-in Windows tools don't work, you can still find the original utility on official support pages and verified archives: You can check the Official Support Page for
Once you have the .diagcab file (even if it came in a .zip or .rar archive): Microsoft Program Install and Uninstall Troubleshooter Download Microsoft Program Install and Uninstall meta rar