I upgraded the bios on my Gigabyte GA-Z170-H3DP to F5i for the Skylake cpu bug fix and the free Win10x64 Pro became un-activated. Never had a bios upgrade do that before. So it appears the Win10 uses something in the cpu as part of the activation info, if I understand how the Skylake bug fix works.
Got it reactivated using the key from the Win7x64 Pro that was installed before.
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