I've just upgraded my activated Windows 7 Professional to Windows 10 Pro.

I upgraded, rather than making a fresh install.

During installation I was asked for the product key, it wasn't accepted, so I proceeded without the key. Now when I try to activate I get this error:

You are running Windows 10 Pro. The Product key you entered cannot be used to activate this edition.
Error Code: 0xc004f210

I looked into similar questions like this and this, but the difference is that I upgraded (rather than doing a fresh install) from Win 7 professional to Win 10 pro. I don't mind reinstalling win 7 and doing it all from scratch again. But I was wondering if there was an easier way.

  • Important thing to note here is only Windows 10 version 1511 or newer will accept W7 or W8 key
    – clhy
    Jul 26, 2016 at 6:05
  • But when you upgrade using Microsoft's online tool, don't you get the latest version anyway? the tool I used was Windows10Upgrade20663.exe Jul 26, 2016 at 6:07
  • I've just checked, I have version 1511 Jul 26, 2016 at 6:08

2 Answers 2


The error code 0xC004F210 means that the Windows 7 key is a different SKU

// MessageText:
// The Software Licensing Service reported that the license edition does match the computer edition.
#define SL_E_EDITION_MISMATCHED          ((HRESULT)0xC004F210L)

During setup of Windows 10, simply skip the key. Windows 10 will detect that you already did the upgrade and shows Windows 10 as activated after setup is finished.


If you are upgrading or have previously upgraded to Windows 10 and the upgrade was activated by Microsoft you do not need an activation key.

If you have no product activation key, you can install from scratch (wiping the drive and re-installing) only if you have previously upgraded or installed Windows 10 and activated it.

When installing from scratch, at the beginning of installation it asks if you have a product key. Just click the correct answer. If you have no key, the windows installation will check for a previous activation on your computer and automatically re-activate it for you.

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