Stand alone in Sturmovik website and DLC for IL-2 Sturmovik Battle of Stalingrad in Steam Store, also you can link Sturmovik account with Steam and you have all purchased products in one game.
Kinda wish we had the 85mm gun in the KV1, not so much an issue in single player, but in multiplayer the Russian side has only a few guns to deal with tigers and elefants.
