https://github.com/niftools/max_nif_plu ... /max-0.1.2
That's where you end up after going through the site's download page, and it doesn't have any plugins compiled. I loaded up the .sln in Visual Studio 2010, but it throws an error since there's no .vcxproj file. The README.txt file just says that you should have an installer, which will install the plugin automatically.
There's no installer. Just a bunch of source code with no instructions on how to compile it. Any chance of getting the latest plugin?
Edit: To clarify, I'm intending to edit Oblivion and Fallout New Vegas .nif files. I know that Skyrim and Fallout 4 have plugins up on Nexusmods that support newer versions, but AFAIK they break backwards compatibility.