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Microsoft has made errors concerning the WSUSSCN2.CAB catalog file, yes. Usually we work around through a static definition.

Windows Update not detecting installed updates correctly might have to do with the different branches of updates in existence. There are GDR (General Distribution Release) and LDR (Limited Distribution Release, the old name was QFE - Quick Fix Engineering). LDR updates without a GDR counterpart (or GDR satisfaction stub) might trigger WU/MU to install the GDR one although it's not required.

@cecinit
No.
Windows Update will not reinstall the updates, even if they are not listed in its history.

@WSUSUpdateAdmin
Are the updates listed, if a msu-file is installed using dism?

Hi.

aker wrote:Are the updates listed, if a msu-file is installed using dism?

MSU files install (and register) fine using wusa.exe.
Using Dism.exe, some threw unexpected and strange errors (%errorlevel%), so I decided to stay with wusa.exe.

RTW

Thanks for the info, and for looking at how to make this work the best way possible! Great job.

I didn't know the difference between "view update history" and "installed updates" myself, until you pointed that out. Thanks!