Helltharin

Hello, I m new to this forum and game. yesterday I downloaded via steam Arma 2, Arma 2 O.A and Dayz mod. When i try to log on a server the message "bad version, serer rejected connection" pops on my screen. Do you have any solution? Thanks in advance. Re: I fixed the problem and now when I join a server an error pops saying The file ArmA 2: OA stoped working