It was downloaded as a zip, so I renamed the file extension of the zip to .rbz.
I then used the extension manager to install the plugin by choosing the .rbz file that I made from the zip.
The manual for this plugin says that the plugin will be accessible from the draw menu in Sketchup, but it is not there. In the extension manager it says that it is “unsigned”:
That extension predates the extension signing system, but unsigned will have no effect unless you have set the extension manager “Loading policy” to higher than the default “unrestricted”.
Did you restart SketchUp after installing the plugin? That is probably necessary because it is a traditional plugin, not really an extension. It should add a submenu item to the Draw menu and should create a Toolbar.
You are loading a VERY VERY old version.
It was updated [for v2015 compatibility] some years ago [by me for Didier]. SketchUp Plugins | PluginStore | SketchUcation
I’ve just tried it in v2018 and it does work…
Because it is so old it is unsigned, ensure your Extension Loading Policy is set to ‘Unrestricted’.
Please remember it is old and clunky !
With inappropriate settings, which might produce hundreds of instances, it can take ages to run !!