Which I find interesting. Because if I only had, say, Win 7 Home on a PC and I've done a complete fresh install of 10TP then they're going to need some sort of additional validation check before issuing a key for 10. I've a good record of all my licence keys, but if others haven't kept a record then which way will MS go?As told before which licensed version of Windows 10 you get does NOT depend on the version of the Insider Preview you are using. It depends on the licensed version of Windows 7/8.1 you own.