The Gold Edition can not install Dawn of War 2 (just the 2 - we do not speak of the Chaos Rising expansion) because the key is uen erroneous CD key and corresponds to a Dutch / French version of the game.
If you purchased this version is not compatible with Steam and you'll be stuck with "Buy" option on Steam, instead of "Play"
And even if you think you manually turn the key on Steam, do not do it because the key is, 99% erroneous.
Version to flee to retail - it is better to buy it directly on Steam to avoid wasting money.
Also important clarification: my copy arrived with two manuals (DoW2 and Chaos Rising) chipped and torn - I guess my copy had already made the round trip with another client who has had this problem ...
