You should be able to select The Unarchiver to extract the files once you fully download the .zip from your game page (not pausing the download) by right-clicking the "Catlateral Damage v1.0.8 Mac 64-bit.zip" file in Finder. If that doesn't work, you can try moving the game files to another folder and running the app from there. Let me know if you're still having issues playing!