Upgrade Windows 10 to Windows 10 LTSC Without Losing Data This is not a official way and fresh install is always recommended First you will need to make some registry edits, so navigate to this location. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion.

Now change to these values:
Key Name New Value
CompositionEditionID = EnterpriseS
CurrentBuild =19044
CurrentBuildNumber = 19044
DisplayVersion = 21H2
EditionID = EnterpriseS ProductName = Windows 10 Enterprise LTSC 2021
ReleaseId = 21H2