Sounds like MS calls the Apple OS a full version so you only need to purchase the upgrade version ($49). In case you haven't used the upgrade license before, both the media and the key are full versions of the OS; it's just the to be compliant with the license you need to install it on a computer with a licensed windows OS sticker on it and not an actually installed OS. Also, for those of us that grabbed Windows Basic or Starter editions to save a few bucks, Education is given an upgrade path from starter and basic versions of Windows to Professional.
I hope that helps?
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