If you go to COH website and sign into Steam, you get the Stalingrad DLC for free. The below article just says go to Steam which I don't think gets you the DLC.
Company of Heroes 2 is free for keeps this weekend | Rock Paper Shotgun
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Company Of Heroes 2, the high point of their World War 2 operations, is free to download this weekend. Likewise, the rest of the wartime franchise has been cut to a quarter of the cost ’til Sunday evening.
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