activate windows 10 with win 7 or 8 open license key

i have open license for win 7, 8 and 8.1
i got the upgrade from 7 to 10 for free but i decided to install a clean copy of win 10 instead of upgrade win 7
after successful installation process i can't activate win 10 with any 7 or 8 key what can i do
MASWORLDAsked:
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Cliff GaliherCommented:
You *have* to run the upgrade from a valid activated OS at least once in the machine you want to upgrade. Old keys do not activate win10. The upgrade process verifies the existing OS and generates a new license during upgrade.
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JohnBusiness Consultant (Owner)Commented:
If you do a fresh install of Windows 7 or 8 (8.1) and then immediately upgrade to Windows 10, you will essentially get a fresh install of Windows 10 - no baggage to carry forward.
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McKnifeCommented:
http://www.experts-exchange.com/questions/28711261/How-do-I-install-a-clean-Windows-10-Pro-without-the-need-to-upgrade-an-existing-OS.html#a40962113 shows a way to a clean copy without going through the upgrade process.

Please note: this does not mean you can do it without ever having an activated win7, no.
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Matthew DemareeBusiness Owner/Support SpecialistCommented:
You could use your system recovery (usually F11 on bootup) to revert back to Windows 7/8/8.1, run the crucial updates and then you could upgrade to windows 10 from there.
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