In each version, you can get the default plugins path, by opening the Ruby Console and typing: Sketchup::find_support_file(“Plugins”)
To copy a component on a Mac the “right hand options” key is the right hand alt key. So select the Move function and press right hand alt and a + appears beside the move marker, then just move and a new copy appears. THEN … to create several copies inbetween the new and old complete the move and enter 5/ to get 5 equally spaced items.