hendrikl: OS X (10.11) says the File is corrupted, I tried to download it severals times. The DMG unpacks fine, but when I try to launch the game OS X says it's corrupted and recommends to move it to trash. I think it's a problem on your side.
Despite the error message try this solution:
Game "can't be opened because it was not downloaded from the Mac App Store" error message
a) System Preferences -> Security & Privacy -> unlock to make changes -> select Mac App Store and identified developers.
or
b) Right-click (or cmd-click) the game -> Open -> confirm Open.
If that doesn't work then
solution #1?