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    Windows 7 product key not accepted for windows 10 upgrade
    Monday, October 19, 2015 5:09 PM

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    Hi Yohaness,

    Yes, Windows 10 build 10240 won't accept Windows 7 product keys.

    The only way to make the free upgrade work is to upgrade from your activated Windows 7 system, and then boot into Windows 10, connect to Internet to have it activated, after that, you can have clean install available.

    Help with upgrading to Windows 10

    http://windows.microsoft.com/en-us/windows-10/help-upgrade-windows-10

    Besides, if you would like to try Windows 10 insider preview 10565, then you can activate it with your Windows 7 product key, which is documented below:

    Announcing Windows 10 Insider Preview Build 10565

    Regards

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    • Proposed as answer by Michael_LS Thursday, October 29, 2015 2:09 AM
    • Marked as answer by Bruce Wooding Saturday, November 14, 2015 1:49 AM
    Thursday, October 22, 2015 2:05 AM