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...