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I can't seem to find a way to upgrade my laptop Windows 8.1 (64 bits) OS to Windows 8.1 Pro. I do have a key for the new version but when I input it in the Windows updater, it tells me:

This key won't work. Check it and try again, or try a different key.

I'm using my MSDN and I know nobody used those keys.

To enter the key, I go to Control Panel - System, I see Windows Edition as 8.1. I click on "Get more features with a new edition of Windows" link, and in the popup "Add features to Windows 8.1" I select "I already have a product key".

Should I maybe just download the entire Wind 8.1 Pro ISO and run the install instead? I would imagine the Windows Upgrade Tool would do it in a cleaner way.

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Where are you entering the key? In the Anytime Upgrade area? –  user3463 Nov 20 '13 at 21:17
    
Control Panel - System, I see Windows Edition as 8.1. I click on "Get more features with a new edition of Windows" link, on the popup "Add features to Windows 8.1" I select on "I already have a product key" –  Johnny Nov 20 '13 at 21:25
    
Tried contacting Microsoft support? –  tumchaaditya Nov 20 '13 at 21:26
    
The reason the key isn't working is because you cannot upgrade to just Windows 8.1 Professional your only upgrade path is the Windows 8.1 with Media Center. You can try the full installer media method if you want but it won't work without a full reinstall. –  Ramhound Nov 20 '13 at 22:08
    
@Ramhound no, I was also able to upgrade my Win8 Core to Pro by adding a Pro key in this dialog. So it works. I only used the cheep promo keys that MS sold during Win8 GA. –  magicandre1981 Nov 21 '13 at 4:51

2 Answers 2

up vote 2 down vote accepted

For me, it wasn't working because by default the locale for everyone in MSDN downloads is UK, no matter where you live. If you search "Windows 8.1" by default the first result that shows up is the UK Edition, If your locale is the U.S., make sure to search for "Windows 8.1 (multiple editions) (English)" in your MSDN product keys.

Note: If you're running Windows 8, you must use a Windows 8 Pro product key and not a Windows 8.1 Pro product key. If you are running Windows 8.1, then you must use a Windows 8.1 Pro product key.

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You don't now if that's the reason it wasn't working consider rewording your answer to reflect that fact –  Ramhound Aug 10 at 15:57
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What exactly do you mean by that? –  kirill2485 Aug 10 at 16:36
    
You can't know this was the authors problem –  Ramhound Aug 10 at 16:52
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But then, @Ramhound, Stack Exchange sites are not intended to only help the OP? (I hope my edit suffices?) –  Arjan Aug 10 at 16:56
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Oh well would you look at that, it was marked as correct, I guess I was right in the first place... Thank you :) –  kirill2485 Aug 12 at 0:21

In Windows 8 search for Windows Anytime Upgrade or type WindowsAnytimeUpgradeUI.exe in the Run command

See http://www.petri.co.il/change-windows-8-1-edition-without-reinstalling.htm

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