Windows update KB4565351 fails with error 0x800706be

I have a problem with Windows Update. An update fails every time, causing the computer to be locked out of new updates. 

The problem is with update KB4565351.

I'm using 64-bit Windows 10 version 1909, running on a ThinkPad X201 laptop. The update fails with error code 0x800706be.

First try: Running Troubleshooter for Windows Update

First I tried the troubleshooter for Windows Update. Like I expected, it did not find any problems. Oh, well.

Second try: Resetting Windows update

Next up, I tried this solution to reset Windows update:
https://appuals.com/fix-windows-10-update-error-0x800706be/

It did not help. I still got the same error. 

I also found another, slightly different solution for resetting the Windows Update.

Third try: downloading the update manually from Microsoft Update Catalog

Then, I tried downloading the KB4565351 manually from the Microsoft Update Catalog. I got the version for x64 Windows 10 1909. After downloading, I ran the package by double clicking on it. Windows Update Standalone Installer started.

It showed the following messages:
Copying packages to the Windows Update Cache...
The updates are being installed
Initializing installation... Done!
Installing Update for Windows (KB4565351) (update 1 of 1)...

It took a really long time, and seemingly got stuck at about 20%. I waited for an hour and got fed up with it. Then I canceled the process.

But canceling got me nowhere. The update was stuck there. I restarted the computer and selected "restart anyway" and found myself back on square one.

Fourth try: Trying to reset Windows Update, again again.

I tried this:

1) Turn off Wifi (set airplane mode on)

2) Start cmd.exe as administrator and type

taskkill /f /fi "SERVICES eq wuauserv"
net stop cryptSvc
net stop bits
net stop msiserver
net stop wuauserv
cd c:\windows
ren SoftwareDistribution SoftwareDistribution.old
rmdir /S C:\Windows\SoftwareDistribution

3) Restart the computer and try Windows update again.

No help.

Fifth try: Trying to reset Windows Update, again again again

I followed the instructions here:

The script ran through, and after a reboot and running Windows update I was back to square one.

Conclusion

I'm currently out of ideas. Seems like a repair upgrade of Windows 10 is the only way to go from here. For that, I need to backup all the data and basically reinstall Windows 10 on top of the old installation. Unbelievable.

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