thanks for testing and replying :)

first of all, schame on me for forgetting the basics of games installing (turn off anti-virus), but it still did not work.

but i found a work around:
When i close the installer after letting it patch for some time, using the task manager, the game files do not ...

This time: Escape Academy

Had the same problem with:
Entropy Center, Doors Paradox, PC Building Simulator 2 and Dead Cells (maybe i have forgotten one or two)

The only game that installed without problems was "Tales of Arise"

Hey folks,
90% of the time i got the problem that the installer does not finish installing the game.
After reaching 100% there is the notification:

Please wait! Patching files...
Do not panic if things appear stuck!

But it definitely gets stuck cause the "patching" does not end. The funny part ...