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This post seems to indicate it should work.
windows 8 oem upgrade to windows 8 pro MSDN
Are you sure you're using the Pro key?
4. Click on "I already have a product key".
5. Enter your MSDN Windows 8 Pro product key.
Is exactly what I did, with the Technet (think same as MSDN) Win 8 pro key.
I get: "This key won't work. Check it and try again, or try a different key."
The Technet key & Retail/OEM full key will work OK.
My Computer
System One
-
- OS
- ME, XP,Vista,Win7,Win8,Win8.1
- Computer type
- PC/Desktop
- Other Info
- Notebooks x 3
Desktops x 5
Towers x 4