Just OA. Gift it to an alternate steam you control, go through the purchase method, blah blah, get into alternate account, library>arma2OA right side says somehting with the word key in it. click that. copy to clip board, open notepad, ctrl+v that shit. remove hyphens, copy again, open Lockdown's key changer (should be on front page), insert key, hit enter. All set.