Damaged Application

I could play the game for a while. but Today when I go to play there is this Error Message telling me the App is damaged. I just played it yesterday... so wth? I payed for this? I deleted it and re downloaded it and installed it 3 times now and I get the same message. I’m getting so frustrated that I actually wrote a review.

ohwhydidntthishappen about Star Wars Jedi Knight II: Jedi Outcast