[TorqueDog]

Originally Posted by Vulcan

I believe you can now activate Windows 10 with a Windows 7,8, or 8.1 key.

http://www.howtogeek.com/224342/how-...ll-windows-10/

as said though on a new computer you need the retail windows version.

Yup. Make sure you're using the latest available install media, however. The 'RTM' of Windows 10 from July 2015 wasn't able to install with a W7/8/8.1 key. You had to install without a key, pick the proper version to install, then activate once installed.

The November release (media with build 10586) allows using previous OS keys in the Setup program.