If you land on this page and are unfamiliar with how to install Sketchup Extensions such as LibFredo6 or how to register on Sketchucation, please watch this video or refer to the Plugin page of LibFredo6.
Usage: Licensed under Sketchucation SCFLicense.Sketchucation ExtensionStore: v4.2.9 or above (for licensing).
This is also where you can download the RBZ file. The information on Curviloft is maintained on the Plugin Home Page of Curviloft.