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That explains that then. I only ran it on one machine and only tried to enter a key once. Nobody else in my house has any real desire to test anything other than me so i only have one machine on Windows 8.

There should be a Windows 8.1 ISO download at some point for those who buy Windows full 8.1. But to upgrade from 8 you should use the Store upgrade option. 8.1 full ISO seems to require a new license key and your old Windows 8 one won't work, while the Store upgrade is just an upgrade. I say...