I've downloaded the 2Dtool(s) from TIG for line color, line weights, and much more.

2D Tools | SketchUcation

3D SketchUp Community for Design and Engineering Professionals.

(sketchucation.com)

I'm struggling to install it properly as its a TOOL but described to install as a plugin. I'm using a MAC using Sketchup 2016 pro. The file ends in .rbz and I've tried to install as a tool, plugin, alter the file extention and can't seem to find an alternative in the extensions warehouse. Its seems to be in the proper folder (as a plugin) but won't recognize when restarted.

I'm missing something simple and any help would be appreciated.