So I have a copy of win 8.1 Pro 64 bit OEM. I wanted to add Media Centre to this so after following lots of links (from Add features) I managed to download and install what I thought was the stand alone Media Centre. It turns out it was not a stand alone but in fact "upgraded" my OS to Win 8.1 Pro with Media Centre (a retail version). Now I don't have a licence for retail, only OEM and my PC now...
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