Windows 10: Error 0xC1900101-0x20017 during 2018 feature upgrade installation

I'm trying to install the 2018 feature (1803) upgrade on a desktop running Win10 Enterprise x64 V1709-Build16299.371) with an Asus P6T-Deluxe V2 motherboard and ATI Radeon HD7700 video card.

On running Windows, I start with evaluated administrator-permissions the setup.exe from Windows 10 Ent x64 V1803 ISO-Image. The question about loading updates online I answered with no and on second try with yes.

The update gets to 100% installed, puts up a msg saying that it wants to reboot, spends a couple of minutes showing the blue "Restarting" screen, then reboots. BIOS is finish to and boot screen is coming.
The reboot freezes at the point just after POST finishes where the blue Window 10 logo appears in the middle of the screen - no further activity takes place - I left it sitting for an hour without anything further happening.

If I power off and reboot, it boots into Windows normally and puts up a notification saying that the update could not be installed.



Checking the system event logs shows that the update failed with a 0xC1900101-0x20017 error, which seems to be some sort of driver problem, but it doesn't indicate which driver is the issue.

I've unplugged everything I can - the only video card, and the mouse and keyboard are the only USB devices. I also used SFC and DISM to check the existing Windows installation - unistall KIS (antivirus) - but I didn't find any errors.

My logfile from upgrade see here: >> setuperr.log

Any suggestions on a fix?
Thread Error 0xC1900101 during 2018 feature update installation I have read and used to try to fix. Firewire-device is disabled in BIOS - But no success.

:)