Grasshopper Plugins Not loading

Hi, I am having trouble getting any Grasshopper plugin to load into the program. I have downloaded the plugins, unzipped, unblocked, transferred to components folder, restarted the program. They will not load into Grasshopper. Been following tutorials, and how-to’s. Maybe there’s something I’ve missed? Any insights would be appreciated!

Rhino command ‘PackageManager’?

Depending on the version and surely the OS directory is not the same.
So far here what I give to the people using my plugin (4 different locations possible)
“C:\Users\UserName\AppData\Roaming\McNeel\Rhinoceros\packages\8.0\Nautilus”
“C:\Users\UserName\AppData\Roaming\McNeel\Rhinoceros\packages\7.0\Nautilus”
“C:\Users\UserName\AppData\Roaming\Grasshopper\Libraries”
/Users/UserName/Library/Application Support/McNeel/Rhinoceros/8.0/Plug-ins/Grasshopper (b45a29b1-4343-4035-989e-044e8580d9cf)/Libraries/