not working for me I've tried changing the ID and edition name to every permutation of HOMEPREMIUM, Home Premium x64 that I can think of. And professional. And even Home Basic. Nothing works. No matter what I change it to in every instance I get the same stupid reply that I can't upgrade Windows Ultimate to Windows Professional. Does this mean we certainly have to upgrade the DigitalProductID key or something like that in addition to the EditionID and Product Name?