Well i dont know if this thread is dead but (wish me luck), Ive purchased ArmA 2 Combined Operations NON-STEAM from Bohemia store installed it followed the instructions and player dayz and boot camp, day later the poeblem "Bad serial given in setup" reinstalled deleted registry path for OA (Operation Arrowhead is the error BTW) and reinstalled, patched and played, after 3 hours, same error, can ANYONE help me? Ive looked at s**t ton of others but for steam and not for NON steam version, Im starting to think that ive wasted my money. PLZ help me fast!