Downloaded it from the recommended chip.de server.
When I finish installing, it opens the launcher and when I want to go to the In-Game Menu nothing happens.
When I want to start it directly, it says, that I miss an .dll file. ( audio3d or something like that )
I reinstalled it several times. Always the same.
Also:
when I go to the "Server" Tab in the Launcher and try to refresh the Ping, it freezes.