Win 7 home/pro to Win 10 home/pro. Do I actually need to install Win10 within the next year to get MS to store my hardwares ID so that I in e.g. 2 years can clean install win 10 on a new blank HD? Or what part of the upgrade process stores my hardware ID with MS? Thx all
You got it exactly right. You need to upgrade once, so that a specific hardware ID can be created for your machine and is then saved on MS servers. After that, you can directly format your drive and install a fresh copy without entering a key. After rebooting, your machine is instantly and permanently activated.
thx was fearing that but was hoping I didn't have to really install it and then roll back right after that but that is the only way then.
If you want to keep your current OS for now, get a spare hard disk and install your current OS on it and than upgrade to Windows 10. Rolling back to a previous OS is always a risky procedure.
I think after a year they will remove the functionality to update to Windows 10 from Windows Update. So, you have the chance to update till 29th July, 2016.