Agx DANGEROUS

whenever i load a sever using six launcher, it says that (You cannot play/edit this mission, it is dependent on downloadable content that has been deleted)...can somebody please help me?...also my brother dosnt know how to get arma 2 oa updated to version 1.62.96016...i have no idea how to help him..if you could, please help me with that too. thanks

thank you very much, i will try all of that and hopefully it works =D

have just got dayz and arma 2 today. i am trying to join a server but the top half of my screen goes grey and the bottom half is white..then orange squares appear like its giving me options but i cant read any of it. there all blank and i have no idea how to fix this. i have tried on many servers but i cant get it to load. is there a way that you can help me resolve this problem?