KB5021089 Not Installing on Windows 10 – How to Fix?

While installing KB5021089 (cumulative update?) on Windows 10, there was some obscure error in the Windows Update. Restarting the PC doesn’t help and I don’t really have any other ‘fixes’. I haven’t had this problem with installing updates before. I have a legal copy of Windows 10, not pirated, so there should not be such issues, at least I don’t think so.


If you’re having trouble installing update KB5021089, we recommend that you read our Ultimate Windows 10 Troubleshooting Guide. You’ll find all the information you need there.

Ultimate Windows 10 | 11 Update Troubleshooting Guide

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