Hello! I recently got a non-steam version of ArmA II - Combined Operations. When I launch it, it shows that bohemia intro and the crosshair, then closes and gives me the error "bad serial number given in setup". How do I fix this? I've tried the suggested solution, and I don't even see "Bohemia Interactive Studios" in my registry.
Note: I don't have admin rights on my computer, so I cannot edit the registry.