Thank you for the suggestion. I did not try this yet, but finally found a solution reading other threads of the tech support.

I had to go to the .../OpenAl/2.0.7.2/ directory and there double click the "oalinst.exe" which installed OpenAl and made the game start correctly.
Now the game runs without ...

I unfortunately have the same problem.

Up to 1.5.2 the game ran without problems, but since it was patched to 1.6 via steam, I can click the play button in the launcher menu without any result - the game simply does not start.

- I uninstalled the game, deleted all remaining files in my "mainuser ...