ArmA 2 OA Problem

[ArmA 2 OA Problem]

Hello i have problem in multiplayer game. I choice server and my written : Bad Key ; Invalid CD Key ; Reject Connection.

#1.Maybe, because i haven't DayZ mod i try to put it but don't have a nothing different.

[Arma 2 OA Multiplayer Problem]

Yea i know this links but i want just comment with instructions , how to fix this "Invalid CD Key" - "Bad key" I very very want to play this game multiplayer but i watch videos and i can't fix it ... :(

[Arma 2 OA Multiplayer Problem]

Hello.Today i downloaded the game and i click multiplayer and i choice someone servers and i join and my written : "invalid CD KEY" Please help :S