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I have a trial version of Windows 8 Professional that expires in February 2014. For my usage Windows 8 or Windows 8 Core versions are enough. It it possible to downgrade it to the normal non-Professional version of Windows 8 when I buy it officially? Do I have to re-install it completely or do I only have to enter the new registration code?

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A Windows Professional installation will not accept a Windows Core license. The same is true with Windows 8 Professional Media Center not accepting a Windows 8 Professional license. This limit isn't actually new. Windows 7 Professional would not accept accept lower versions of Windows 7 either. – Ramhound Aug 28 '13 at 18:08
@magicandre you don't need to sprinkle code formatting all over the place. Just use it for places where you actually have code, commands, or other text that actually needs to be monospaced. – nhinkle Aug 28 '13 at 18:50

You can use this small tool called UpDown8.

Select which edition you want to downgrade:

UpDown8 screenshot

and click ok. Now insert the Windows 8 Core Edition DVD, run setup.exe and select Upgrade. This downgrades Win8 Pro WMC to Core.

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Forum is not working anymore (cannot register), but I found download link for UpdDown8: – Goran Obradovic Feb 23 '14 at 10:46

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