Thanks for your posting on Q&A.
According to your description above, it seems that the Server failed to install the latest Cumulative Update due to the corrupted OS. First, it is recommended to repair the corrupted OS first.
We have to get a source to repair. Please refer to the below link for reference:
Then we could run the
Dism /Online /Cleanup-Image /RestoreHealth /Source:c:\test\mount\windows /LimitAccess command to repair the OS.
Hope the above will be helpful. Please let me know if there are any questions or updates of the case.
Have a great day.
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