The Windows 10 major version is probably from 2021 or 2022, as that is my rendering machine for DAZ Studio (3D art program) and I am very cautious about breaking something that works. It spends most of its time not connected to the Internet unless I'm doing something that requires it (such as my attempts to install .NET 3.5).
Windows 10 come with .NET Framework 4.x (NOT 3.5). They are separate frameworks.
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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full[/B]. That should list some folders at the left hand side, containing version numbers. You can also double click on the last entry on the right hand side, called "Version". The bottom value "Value Data" will show the current installed version number.
Now that looks useful, although as per the "Turn Windows 10 Features On or Off" .NET 3.5 is not checked, and clicking the checkbox and trying to enable it that way already failed.
There is one more method I have found but not tried yet, but I would have to download Windows 10 OS install files and create installation media so that I could try via command line.