Hay Adm I dont know where to put this (kinda new for me)
The add on (zip file) @github for older versions like blender 2.79 wont open I am working on a Mac.
I tested a little further and installed the add on in Blender 2.7 which worked.
But when I try to open the zip file on the desktop with the default mac OS unzip app (called Archive Utility).
I get an error message, tried it with 2 computers Mac OS10.9 en Mac OS 10.10..
all other zip files are ok sofar as I can see.
Had to download winzip for mac to open it.