I am trying to get the RoundCorner plugin from Fredo6 and have installed all of the necessary plugins and moved them to the correct (?) folder. It still isn't showing up in SketchUp anywhere.

I can't figure this out either. I want to get the KT lights to show up in Sketchup for rendering in Kerkythea as well as the slicer tool. Here's the screen shot of what happens when I open SU and also a screenshot of where I've placed the plugins.