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...

For years, every DLC (including DayZ) had their own subfolder located in the A2 OA folder. Now, I have four OA folders in steamapps/common, each for their own DLC. When and more importantly why, was this changed. I doubt I'm the only one who has this.

Is there anyone who still plays the game?

just wont work, any tips?

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.