Hi
After searching some infoemation , I have found something new.
Here is the link about windows 10 upgrade paths.
https://docs.microsoft.com/en-us/windows/deployment/upgrade/windows-10-upgrade-pathsWe can upgrade from Windows 10 LTSB to Windows 10 semi-annual channel, provided that we upgrade to the same or a newer build version.
For example, Windows 10 Enterprise 2016 LTSB can be upgraded to Windows 10 Enterprise version 1607 or later. Upgrade is supported using the in-place upgrade process (using Windows setup).
We could do an in-place upgrade manually with the ISO
Here is a similar link we could refer to
https://community.spiceworks.com/topic/2202407-1607-ltsb-to-sac-in-place-upgrade-possibleAbout downloading iso files , please refer to this link
https://www.tenforums.com/tutorials/9230-download-windows-10-iso-file.htmlBest Regards