I just bought Arma 2 and Arma 2: Operation Arrowhead to play DayZ. I began to download DayZ and everything was fine until Battleye anti-cheat which I have no idea how to install — at first it was saying "!!! MISSING STRING" when I clicked "Reinstall Battleye anti-cheat" but now it just says "this game is currently unavailable. Please try again at another time.". I can start the games but when I attempt to join a server, most of them say "Bad version, server rejected connection" — I'm pretty sure this has to do with the Battleeye. I'm on Windows 7 64 bit and I installed Arma 2 and Arma 2: Operation Arrowhead on steam. Any help please?