Q. What process is used for the upgrade between Windows 10 branches?
A. The update process from a down-level OS (e.g. Windows 7, 8.1) is the same process used to upgrade between branches of Windows 10. The process documented in FAQ Q. What happens during a Windows 10 upgrade? available at http://windowsitpro.com/windows-10/learn-ins-and-outs-what-happens-upgrade-windows-10.