Bad serial number

[sapumas 0]

I downloaded everything according to the steps. i got the six launcher. it loaded the servers. but everytime i try to either quick match or select a match a pop up comes up and says bad serial number given.

how do i fix this?

[Grehbeh 0]

I have the same damn problem i can't play the damn game. Let me know if you found a solution thanks

[L19Soccer 0]

If you have ArmA 2 or Arma 2 Free try re installing it. That's what I had to do and it worked.

[Grehbeh 0]

I got the steam deal thing that included Arma2 and Arma 2 operation arrowhead and i uninstalled them both twice

[lvg 1690]

Try exiting then running it as Admin then starting both arma 2 games