The Battlelog's mainpage says you have it though? Keep trying. I played no problem this afternoon and then some 5 hours ago I tried to join on a friend into Strike at Karkand and I kept crashing and getting kicked and random shit like that. One message even told me: Required Files Missing. Hell, even if I didn't own Back to Karkand already, the files sure as hell aren't missing. They were downloaded in the patch last week. I did eventually manage to get back into the server...and then it ended when I spawned. Fucking gay. At least I spawned on the winning team. Hurrah for free wins!