Thanks, NavyLCDR

I'm dual booting OS X El Capitan and Windows 7 using boot camp on a mid 2012 Macbook Pro. I've tried a Windows 10 upgrade install from the HDD, from a USB and from a DVD ISO: all fail to install.

If I've understood correctly, I'll need to use the key from my Windows 7 installation disc to perform a clean install of Windows 10 on my PC. My Windows 7 disc is the 'update' version. Will the key...