Reserving a copy of Windows 10 ensures you have access to it without needing to purchase a license.
Reserving a copy of Windows 10 ensures you have access to it without needing to purchase a license.
Reserving a Windows 10 copy doesn’t guarantee automatic download or installation; it depends on the source. You can still use Windows 7 even after upgrading to Windows 10.
I'm uncertain about this; it seems like a Windows update, giving you time to decide. It might upgrade your system to Windows 10 without sending an ISO, though they should have them available soon. 2) You could remove Windows 10 and replace it with Windows 7, but you can't change the operating system immediately.
Upgrading will move the key to Windows 10, though it's likely Microsoft mentioned you could perform a fresh install of Windows 7 using the same key even after upgrading. I question whether the installation will start automatically, but it should follow the standard Windows Update process and require a few reboots before you're running Windows 10. If you're concerned about an automatic update during your League of Legends session, make sure the automatic Windows Update option is disabled.