Please install Sketchucation Tools: https://sketchucation.com/plugin/696-sketchucationtools Restart SketchUp after installation Then license Curviloft per the licensing guide: https://downloads.sketchucation.com/licensing/SCFLicense-Instructions_to_Users.pdf You can retrieve your license at https://sketchucation.com/webshop/my-licences.php Curviloft require Libfredo v14.5: https://sketchucation.com/pluginstore?pln=LibFredo6 Try that and report any errors if you encounter them