Currently doing the steps in post #4. Will update later.

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I successfuly upgraded to 1903!

I looked in SetupAct.log and saw that Windows was copying files from the User ...

Update:

I've found two problematic .inf files in the CompatData_XXXXXX.XXXX.xml file:

oem108.inf - Microsoft XPS Document Writer v4
oem109.inf - Microsoft Print to PDF


I disabled those...

Hello,
For the past week I've been failing to upgrade my Windows 10 desktop from 1809 to 1903

The update process is always the same:
The update downloads successfuly, I restart the computer, It...