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officially* MS doesnt support registering W8 Enterprise evaluation, but I wonder is there might hack to do it. By this I mean legally purchasing Win8 Pro DVD and using that key to register installed Win8 enterprise evaluation OS.

*

Q: What happens after the evaluation period expires?

A: If you wish to continue to use Windows 8 Enterprise after the evaluation period, you will be required to purchase and perform a clean installation of Windows 8, including drivers and applications.

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License keys are specific to each Windows version, you can't exchange them. A hack will go against the Windows 8 Enterprise licensing agreement, as Microsoft is crystal clear in the Q&A you provide (from here technet.microsoft.com/en-us/evalcenter/jj552442.aspx) about what to do when the 90-day evaluation period expires. – jaume Feb 15 '13 at 10:57
    
There is no way to legally do want you want to do. The Windows 8 Enterprise trial cannot be upgraded to a non-evaluation installation legally. – Ramhound Feb 15 '13 at 13:00
    
:( tnx you should make that an A, if you dont wanna bother it is ok. :) – NoSenseEtAl Feb 15 '13 at 13:34
    
btw will it copy my existing HDD content to Windows.Old ? I remember I think Win7 being nice and doing that on install where previous installation was detected :) – NoSenseEtAl Feb 15 '13 at 13:55
up vote 5 down vote accepted

Use the tool UpDown8, to change some registry values. When you now run the Setup.exe from a running Windows and select "Upgrade" (repair Install/Inplace Upgrade) the Enterprise Eval is downgraded to the Edition you want.

enter image description here

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does it really do anything? I'm still not getting any options but "clean install" after switching to Win 8 Pro. – user626528 May 9 '15 at 1:33
    
do you run the setup.exe from the running Eval version? – magicandre1981 May 9 '15 at 5:26
    
I've tried setup from the original eval version and 8.1 pro disk. They both don't show any upgrade options. – user626528 May 9 '15 at 8:38
    
maybe it is broken now with 8.1, but it worked in 8.0. – magicandre1981 May 9 '15 at 15:51
    
it seems it works if I set windows edition to "core" and run win 8 pro (not eval) installer. – user626528 May 10 '15 at 10:26

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