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I might have made a mistake, in that I bought an Anytime Upgrade of Win7 Home Premium to Windows 7 Ultimate for a Windows 7 Pro computer. I have tried a few times inserting the supplied key, but errors pop up saying:

"The upgrade key is not valid. Please check the key and try again."

The computer is up to date. But I also know that MS has had problems in the past with the Anytime Upgrade and compatibility too.


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ended up getting an open license upgrade from Win7 Pro to Win7 ENt... with software assurance (well work did). A bit pricey but I do get the free upgrade to Win8 when the time comes... keeping the Win7 Prem upgrade to Ultimate though... use it somewhere :) – Logman Aug 29 '12 at 2:45
up vote 4 down vote accepted

You can not use a Anytime Windows Home Premium to Ultimate on a computer running Windows 7 Pro. It will not work. Depending upon where you bought it you may be able to return it:

  1. Refund
  2. Items ordered from Microsoft Store online
  3. Upgrade Paths
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You cannot upgrade a Windows 7 Pro OS to Windows 7 Ultimate with a Windows Home Premium to Ultimate upgrade key.

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