I recently bought the digital version of Warlock: Master of the Arcane from Amazon. Amazon provided me with a 15-figure Product Code (seperated by two dashes, as in the form of XXXXX-XXXXX-XXXXX). But I can't register it in My Games at Paradox forum (the forum keeps telling me: Invalid Product Code). Since it's the first time I meet this kind of thing, I don't know how to handle it. Could anybody help me? What should I do next?