Premium map pack download

I own BattleField 3 Premium but I uninstalled and then reinstalled Origin. This meant I had to download Battlefield but only the base game and Back to Karkand downloaded (I expect this is because it comes with the limited edition). However, I can't find a way to download the rest of the map packs.. I have tried to 'check for updates' but it didn't work & I cannot be bothered to 'repair install' unless I am certain that is the only way to get the packs. Would really apprechiate some help to such a stupid problem yet again with Origin. Thanks, Cyrus.