bought a new key

got global banned

uninstalled it all then re bought Arma2 OA but didnt buy Arma2

well i get a 'Dayz_anim' requires addon 'CA_Anims_E' error

then i figure it has to do with Arma2 not being installed so i install my old Arma2 (not sure if key is banned) with my new Arma2 operations

now i get a error saying blah blah not signed by a key accepted by this server. to play on this server remove listed files or install additional accepted keys

You can use your old ArmA 2 (it isn't banned), Arma2 OA just needs the chernarus map from Arma2, you can even use arma 2 free

U launch mod DayZ via Arma 2: OA but need through Ama 2: CO