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Can I use the licence I purchased for Windows 8 Professional to activate Windows 8 Enterprise Edition (which has a 90 days expiration period)?

I have a very slow Internet connection and it is taking ages to download Windows 8 Professional through the Upgrade Assistant. However I have the .iso for Windows 8 Enterprise, so I want to install it and save time.

Is this possible?

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No. This cannot be done. You also cannot "purchase" the evaluation of Windows 8 Enterprise. The installation of Windows 8 Enterprise requires an installation media. – Ramhound Oct 31 '12 at 15:52
Oh well. Okay looks like I have to download for another 10 hours. Sigh. Thanks for the quick response! – thetechfreak Oct 31 '12 at 15:58
Reinstalling everything from scratch. Sigh. Thanks for nice evaluation, Microsoft. – user626528 May 8 '15 at 16:10

AFAIK there is no way (even by illegal hacks) to remove the 90 days expiration in the Enterprise demo. Also you can't install it with a wrong key (Pro has a different key)

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actually you can use the "slmgr /rearm" command to extend the trial period legally. It can only be used once, so you get a total of 180 days legally – Moab Oct 31 '12 at 22:13
I read that it wouldn't work anymore? Maybe I remember wrong – Magnetic_dud Nov 1 '12 at 0:44
From what I have read, it works only once, not sure but I think you have to wait until the current trial ends, then rearm. – Moab Nov 1 '12 at 3:03

Open an elevated command prompt, type in:

slmgr /rearm

this will extend the evaluation period another 90 days, it can only be done once and is legal.

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