Windows Update KB5004237 failed with error 0x800f0845

Question

I have tried to install this update twice now. My laptop restarts mid-update as usual, but then tells me "Diagnosing your PC" and "Attempting Repairs". It repairs, restarts, and then reverts the update.

Answer 1

Make sure your laptop has installed May 11, 2021 update (KB5003173) before you install the latest cumulative update KB5004237.
Next, reset windows update components.
Right click on the start button and select Powershell (admin) or Command Prompt (admin)
Write the next hit enter after each line.

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver

After completed, go to here https://www.catalog.update.microsoft.com/Search.aspx?q=KB5004237, download 2021-07 Cumulative Update for Windows 10 Version 21H1 for x64-based Systems (KB5004237) standalone package, manually install it.

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