Comment by int_19h

Ironically, 1.0 is the one that's the most problematic, because it never shipped in any version of Windows by default.

.NET 4.6 is the version that shipped in Win10 back in 2015. Win11 ships with .NET 4.8. Thus, both OSes can run any apps written for .NET 4.x out of the box. I would expect this to remain true for many years to come, given that Windows still supports VB6.

.NET 3.5 runtime (which supports apps written for .NET 2.0 and 3.0, as well) is also available in Win10 and Win11, but it's an optional feature that must be explicitly enabled - although the OS will automatically prompt you to do so if you try to run a .NET app that needs it.