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#11
YES, Windows 7 RTM and Windows 8 Are eligible for free upgrade offer - Windows 10 Forums
I agree, but this doesn't help at the bottom of the link below.
Windows 10 Specifications - Microsoft
3 Must be running the latest version of Windows 7 (Service Pack 1) to receive the free upgrade to Windows 10 via Windows Update.
4 Must be running the latest version of Windows 8 (Windows 8.1 Update) to receive the free upgrade to Windows 10 via Windows Update.