Identify Windows Upgrade Failures Like a Boss (How to use SetupDiag.exe
https://brookspeppin.com/2021/07/07/how-to-use-setupdiag-exe/
WEBJul 7, 2021 · SetupDiag.exe only works if Windows Setup actually runs, extracts all of the source files to C:\$Windows.~bt\Sources, and then subsequently has a failure during one of the steps. It requires .NET Framework 4.6 or higher to be installed on the system running SetupDiag.exe.
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