The best option, in my opinion, is to buy a genuine key for Windows 7 (much much cheaper) change the key on Windows 7, and then upgrade. I did this with my sister's non-genuine 8.1 pro and worked like a charm, and only paid 22? for the genuine key. You can find windows 7 boxes (and i suppose keys) on Ebay (check the seller reputation first).TY for the link
Way too expencive for me. This must be better option then... I guess.
*
Win 8.1 for $119.99
