Microsoft heard a lot of feedback about having to reboot to complete the upgrade so starting with build 14352, a reboot is no longer required when upgrading from the Pro to Enterprise edition.
However, doing this required a reboot to complete. This means all the features are on the device already and the upgrade to Enterprise edition can be performed by changing the product key rather than having to download and deploy a new image. In Windows 10, Microsoft enabled bit-less edition upgrade from Pro to Enterprise. Prior to Windows 10, the upgrade from the Pro to Enterprise edition required a complete wipe and reinstallation ( clean install) of the OS. Starting with Windows 10 build 14352, deploying Windows Enterprise edition gets easier. How to Upgrade from Windows 10 Pro to Windows 10 Enterprise
