All you have to do is sign up for the Windows Insider program and you get a free key to use forever.
"only people running Genuine Windows 7 or Windows 8.1 can upgrade to Windows 10 as part of the free upgrade offer."
www.channelregister.co.uk/2015/06/23/microsoft_apologises_over_free_windows_10_confusion/
(, Fri 26 Jun 2015, 22:02, Share, Reply)