I’ve been a Beta Tester for the past year.
I have never asked a question about Win 10.
I do know your have one year to download it, but once it’s installed you have a perpetual license which MS claims will be for 10 years....
BTW, I've been running Windows 10 since the Developer Preview and honestly really do like it. It's fast, consumes less memory and CPU resources to run than either Windows 7 or Windows 8.x and despite having to go through 5/6 different NVIDIA drivers to get my quad desktop monitors to work correctly I think Windows 10 is a winner.