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Cannot update to Windows 10 version 20H2

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So as the thread title says, I cannot get my computer to update to Win 10 20H2 from version 1909 which I believe was the last successful update. I have tried 6 times to update and each time after several HOURS of what appears to be updating it reverts to uninstalling the update. 


I tried disabling Defender but that didn't help. I ran SFC which found and repaired several corrupt files, still won't update and leaves this alert: Last failed install attempt on ‎5/‎7/‎2021 - 0xc1900101


At the same time, it is trying to install an update for Microsoft Office 2010 (KB2986257) 32-bit edition (158)  that also fails each time leaving this alert: Last failed install attempt on ‎5/‎20/‎2021 - 0x80070643.     I totally don't understand that because this is a 64-bit machine and the only Office 10 I can think of is a starter version that came with the computer. I currently have a 365 subscription on this machine.


I have no idea if these failures are related somehow, hence I'm reaching out for help to update to the latest version of Windows.



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Gary R

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There's a list of things to check through for failed W10 updates at .... https://support.micr...b8-32d177eb136c


Don't use W10 myself, so have no personal experience with it, and can't help further.

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SetupDiag is a free diagnostic tool by Microsoft that is designed to find and parse Windows 10 setup log files to determine why an upgrade or update failed to install on a computer system.

SetupDiag works only on devices running Windows 10. The second requirement is that it depends on the Microsoft .NET Framework 4.6 which needs to be installed on the device it is run on.

If you run SetupDiag without parameters, it attempts to locate log files that Windows 10 creates during the upgrade process in the default folders on the device.

The program creates a results.log file in its directory when it completes the scan which includes upgrade issues that it detected in the log files during parsing.

SetupDiag creates a zip archive of all log files that it processed on top of that which it saves as Logs.zip in the same directory as well.
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Hello, just wondering whether you ever got this resolved. I'm having a similar problem on HP laptop that will not update beyond 1909. I get the same error you had. It fails whether I try and update from Windows Update or using the Windows Update Assistant.
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    Mechanised Mod

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As the OP never acknowledged the offers of help I wouldn`t hold your breath while waiting on a solution from 6stringer, start your own thread and someone will help you there.

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