😕 Remove the stuff from where you put it ! 😒
Unlike a PC the MAC 'hides' the Plugins folder... 😮
Restart Sketchup.
Type/Copy+Paste this into the Window > Ruby Console
Sketchup.find_support_file("Plugins")
It should show you the path to the Plugins folder...
It should be something like
Macintosh HD/Library/Application Support/Google SketchUp 8/SketchUp/Plugins
Put the files/subfolder in there...
Restart Sketchup.
You should now have the menu items etc as expected...
Read the instructions for the tool about activation, usage etc...