I bought 3 copies of Win 8 and also got the media centre key. I have used 1 of them. Today I just received an email from Microsoft that the remaining ones need to be activated by January 31. So looks like I will have to install windows 8 and then Media centre add on to another 2 computers or lose the media center key.
HTPC Intel Pentium G3258 cpu, Gigabyte H97n-wifi motherboard, , 8GB DDR3 ram, onboard graphics. Hauppuage HVR 5500 tuner, Silverstone LC16M case, Windows 10 pro 64 bit using Nextpvr and Kodi
I setup windows 8 64bit last night on a win 7 32 bit computer so I could validate the media key. Just feels such a downgrade. On windows 7 with all the nice windows features like transparency removed. But at least now I can take full advantage of the memory I have installed. The other thing is there is on xp mode on it which could be a problem for businesses. One annoying thing since installing the media key is the desktop now displays the windows build number like the beta used to which looks fugly.