From Friday to Saturday, an error started occurring in my game and it stopped working correctly. When I try to open the game, it gives an error with the DLCs, saying it can't find the game's serial number. I've already reinstalled the game, Steam, deleted files, messed with the registry, and nothing worked. Arma 2 and Arma OA work, but the DLCs won't install. The same error appears for all three when trying to install, saying: "Can't find ARMA 2:OA serial number in registry. Please install ARMA 2:0A and te...

Everything was fine yesterday. I had to uninstall and do a clean reinstall of all the files, starting from Arma2, Arma2OA then I tried the DLCs however NOW I am met with..; >Can't find ARMA2: OA serial number in registry >Please install ARMA2: OA and then re-run the DLC setup again. ..when I try to install the DLCs; all three show this. Upon research I went to the registry and I found my CD key in HEXcode is missing from KEY. (not sure if this could be the cause). Any ideas, please....

On different Proton versions, like Proton Experimental and Proton-GE latest, Arma 2 OA would play perfectly fine, but when I went to go play the campaign, on the 2nd mission when I would die it wouldn't load a previous save, when I would try to load a save it would never load, it would just sit there. I changed to Proton 5.13-6 and added some launch options (I'll paste them here after I finish the post) and now when I try to launch the 2nd mission of the campaign I get an error saying a bunch of downloadab...

I intend to modify their mods to patch a few things. For this, i need permission. If anyone knows where to find them, please let me know.

Is there anyone who still plays the game?