Radi3nt

Thanks for your help, i will talk to my friend again. I just wonder how did the ArmA 2 key work but the ArmA 2 OA didn't.

I'm sure, he got it (I think) from Arma X: Anniversary Edition. He bought 2 copies, one for him and one for me. I couldn't find where to download the game so i had to use the torrent one. The mail that he sent me didn't have the download link.

Big sorry, i meant he bought it for me. Could it be problem with the game version that I download ? It was a torrent version.

I have exactly the same problem as you. My friend purchased ArmA 2 CO from bistudio store and gave me 2 cdkeys for ArmA 2 and Arma 2 OA. The Arma 2 key was fine but when i install Operation Arrowhead, it said "Wrong CD Key". This is frustrating.