Cain on steam: Problem: Cannot start the Undergames Campaign

i already made a steampost about this, one of yours told me to delete the options file in the game data. Did that started the game but same bug.

I cannot select the first lvl in the campaign. Its framed in white but i cannot click it. So i cant start the first mission. Its nice that you try to solve it but if we cant get it to work it would like the 10 bucks back. Thanks for your time.