Help installing .nif plugin for 3DS Max

[SeanS16]

So I have been trying to install the latest .nif plugin for Max 2015 and follow the instructions for finding the root directories for meshes/textures/materials, etc. and it installs the files for me in these paths:

 

AppData\Local\Autodesk\3dsmax\2015 - 64bit\enu\en-US\plugcfg

C:\Program Files\Autodesk\3ds Max 2015\plugins

I can see the new files in these folders, but when I go to export my custom mesh in 3DS Max, I still don't have the option to convert into a .nif. Is there something I am doing wrong with this process? Been at this for at least 3 hours now trying to figure this out. Any help is appreciated.