iLeGaL

Evry time i try connecting to a dayz server via dayz commander i get bad version server rejected connection , could someone plz tell me how to fix this?

So i just bought arma 2 and arma 2 : OP , i am curently instaling them via steam and i would like to know how can i start playing dayz? Do i need to look for server i tought this is 1 server for all :P