Ok - completely accept that you have to uninstall Win7/8 if using Win 10.... but I think your replies mean that I effectively end up with A Win 10 retail licence that allows me to transfer the operating system from computer to computer over time (as I could with Win 7 retail)?
Obviously in that process of moving at a future time to a new computer I would want to do a fresh Win 10 install (not install Win 7 then upgrade) - do I use the original Win 7 activation key?
Thanks again
No, no, no.
A complete misunderstanding.
It's my fault not making it clear, I suppose.
You do NOT uninstall Win 7 /8 if you want to install Windows 10. In fact you need an existing qualified operating system such as Win7/8 in order to get a free upgrade to Windows 10 and be activated.
I said when you install Win 10 over your Win 7 or Win 8.1, the Win 7 or Win 8.1 license is tied up with Windows 10. You cannot use the same license on another computer.
I
did not say Windows 10 has become a retail license.
There is no such thing as "transferring" Windows 10 from one computer to another computer.
Windows 10 ISO is freely available to download and you can use it to install in any computer you want.
When you want a free upgrade of Windows 10 on another computer, that computer will need an existing qualified operating system such as Win 7 SP1 or Win 8.1 which has absolutely nothing to do with the retail license you have installed in the other computer.
I hope I have made it clearer this time.