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Error Registering - Serial not valid in Galactic Civilizations I Stardock Forums

Hello, Recently I purchased a still sealed in plastic physical CD in original packaging, Galactic Civilization Ultimate Edition. I have no problem installing the game on my old Windows XP machine. However, to download patches I need to register the game. When I attempt to register I get: https://www.stardock.com/accounts/register Error The serial entered is not valid. I also have a physi