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today I downloaded the Millennium Version of Windows!
As the window came, where I have to type my licence key in it says that this key is invalid!
What can I do?
Try a different key. There are plenty of them floating around out there. When you find one that works, please report back with the key and exactly which download it was you tested with. Thanks.
(There is also a way to modify the setupx.dll so it does not need a key, but I don't have step-by-step instructions on how to do that off hand)