Porsche2000: Okay, I tested the new GOG update and I have to say they have done a great job. No new errors or bugs or performance decreases. The game works on Win10 from stock, they have updated SHW32.dll by company MicroQuill from 6.0.0.3 to 8.0.0.41 where they fixed correct widescreen support etc. (the same way as SystemPack/Union does). They also updated Binkw32.dll to fix the videos playback.
One strange thing is that when I install the english setup they have a newer Binkw32.dll (version 1.8.0.0) but when I install the german setup the Binkw32.dll has version 1.5.21.0. Maybe you can take a look at this?

I don't see a problem when GOG has its own updated files because when you install Primary Patch + Union everything will get replaced anyway back to what it should be.
Just remove ddraw.dll and dinput.dll when Union is applied.

Porsche2000: What does not work for you?
Just replace GOG's files with those from Union and you have everything working on Union.

h3ad1355: I believe I installed syspack and player kit in october 2021, completed gothic1, played gothic 2 a bit, then put aside for the future... Now I see they updated it in april and my game doesn't launch even when I rolled over to previous update, yeah gj gog now I gotta search obscure german and russian forums for the solution