I got my game on steam and waited until it downloaded. I clicked to play the game but it wouldn’t open and when I hovered my mouse over the app it said that this app wasn’t responding. I had never opened the game and I have no mods. I checked the integrity of the cache files and I also re-downloaded the game again. I have a Macbook Air and I’m on Yosemite 10.10.5. I have never had any other issues like this with any other games on Steam.