Can’t even play the darn game

You get the game all loaded up and log into an account and then… Nothing. It won’t let you play on a MacBook Air 2013 running Yosemite. Says that the app is no longer up to date and needs updating in order to play. There aren’t any updates available so I don’t know what’s going on. Not happy.

Lord of iCloud about SHADOWGUN: DeadZone