I already have a Win8 Pro USB installer setup but I don't think it can be used to do a repair install for my Win8.1 Pro upgrade. So I'm trying to create a new USB installer setup specifically for Win 8.1 Pro. However, the Win8.1 setup window is not accepting the 8.1 Product Key that I extracted from Belarc, ProduKey and WPkey. Is there a way to get around that issue so that I can create the Win...
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