I downloaded the CSGO Legacy Edition today and after i try to launch i got all the time this Error. I already verified the Gamefiles but it doesnt help. Maybe somebody got some tips for me how to fix that :/

I downloaded the CSGO Legacy Edition today and after i try to launch i got all the time this Error. I already verified the Gamefiles but it doesnt help. Maybe somebody got some tips for me how to fix that :/