PL4 doesn't start up - solved, my fault!

Just downloaded and installed PL4. PL4 hangs as screenshot shows. Yes, I rebooted:

System Info:

Gregor, 2004 is an optional update - since it is known for various issues, I did not install it.
1909 should be fine according to DXOs specs:

Had not deleted old stuff from beta phase, sorry for the fuzz!

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