If you mean Torus by Regular Polygon which you will find here http://regularpolygon.org/plugins/torus.php then it is a .rbs not a .rbz so when you dropped it in the plugin folder it installed, but you didn't restart sketchup, which it clearly tells you to do in the installation instructions, before you looked for it so you didn't think it worked. Then after fiddling about with the permissions you tried to make a .rbs install as if it was a .rbz again which naturally failed but coincidentally you had restarted sketchup so the Torus plugin had finished installing and appeared in the draw menu.
Why don't you try installing the Sketchucation plugin store, available from the top of the page, this is a .rbz and once installed it will allow you to auto install many many plugins, including Torus without needing to know what the file type is.
Once you get that to work I imagine you will be heading over to the other thread to clear up any misconceptions about the quality of the balls on the lying chickenshits who have been patiently attempting to help you sort things out.