@jim said:
Install SketchUp STL using the Extensions Warehouse instead of su2stl.rb from the Plugins Store. The Extensions Warehouse in under the Window menu in SketchUp.
SketchUp Extension Warehouse
Your library of custom third-party extensions created to optimize your SketchUp workflow.
(extensions.sketchup.com)
I did as you suggested. Nothing happens. I downladed it. It does not appear in the plugin manager or under extensions to install