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I'm trying to upgrade windows 8.1 to 8.1 enterprise with a product key from MSDN but it says my key is not valid when I use the "Add feature to windows" utility.

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

Then I tried with the .ISO but I don't have the option the keep the installed apps. I have only the option to keep the personal files or nothing.

Then I found this question saying that you need to remove the language packs but it still doesn't work.

The current Windows display language is English (Canada) in the PC Settings. I downloaded the Windows 8.1 enterprise update (English) .iso

There are English Uk and English but no English (Canada) on the MSDN download website.

I don't know if it could be the problem

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Marc
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  • The language and region must match exactly to upgrade from any version of `Windows 8.0` to `Windows 8.1`. Once you do that you can upgrade to `Windows 8.1 Professional` through the utility. But you can't use the utility to go from Professional to Enterprise anyways. – Ramhound Nov 04 '14 at 14:14

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You cannot perform an in-place upgrade from a plain-jane Windows 8.1 to 8.1 Enterprise; you need at least Windows 8 Pro.

From Microsoft's Windows 8 and Windows 8.1 Upgrade Paths:

You can upgrade to Windows 8.1 Enterprise (Volume License) from the following operating system editions:

• Windows 8 Pro
• Windows 8 Pro with Media Center
• Windows 8 Enterprise
• Windows 8.1 Pro
Ƭᴇcʜιᴇ007
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  • Shame I requested my last key for 8.1 enterprise. All I need is bitlocker and it's avalaible with Windows 8.1 Pro. Thank you – Marc Nov 04 '14 at 14:12
  • You also can't upgrade to Enterprise through the `Add feature to windows` utility anyways. You can do an in-place upgrade following the supported upgrade paths though. – Ramhound Nov 04 '14 at 14:14
  • I managed to get a key for Windows 8.1 pro and it works! Thank you! – Marc Nov 04 '14 at 14:18