Windows Update Fails with Error 0x800f0900

[Iasconer6]

Hello,

I'm running Windows 10, Build 19045.4412, and have tried installing the latest update (KB5039211) three times, but it always fails with error 0x800f0900.
I've troubleshooted Windows Update with no issues found. Running SFC /scannow gave the error: Windows Resource Protection Could Not Perform the Requested Operation.
I also tried Repair-WindowsImage -Online -RestoreHealth and got: "Repair-WindowsImage' is not recognized as an internal or external command, operable program or batch file.
Thanks for your help.

 

[Bastet]

Right click on start & choose powershell/terminal with admin & type/copy & paste these cmds one at a time then click Enter:

DISM /Online /Cleanup-Image /StartComponentCleanup 
DISM /Online /Cleanup-Image /RestoreHealth
SFC /SCANNOW

If problem remains then try an in-place repair by downloading the Windows 10 .iso, right click & choose Mount then double click on setup. Continue with installation & ensure Keep everything/Keep personal app & files is automatically selected & allow the repair to continue. Once finished check for updates again (the repair may install an updates needed so updates may not be needed).