Python for . NET project moved from SourceForge to GitHub in 2014.
WinPython comes with pythonnet pre-installed since 2016.
In any Python distribution the easiest way is to install with pip from PyPI:
pip install pythonnet
Other installation options here:
https://github.com/pythonnet/pythonnet
I have a user that needs Python for .NET to work with
https://sourceforge.net/projects/winpython/files/WinPython_2.7/2.7.9.1/
I'm guessing it isn't a problem that he has WinPython as opposed to regular
CPython, but I don't see support for 64-bit on
https://sourceforge.net/projects/pythonnet/