Hi @CE ,
there is no upgrade/update path from Windows Server 2019 to Windows 10 Pro.
You need to install a new Windows 10 Pro on your server.
- Backup the data of the Windows Server 2019
- Install Windows 10 Pro / delete the old Windows Server 2019 partition(s)
May I ask you why you require Windows 10 Pro on a server?
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Regards
Andreas Baumgarten