If you decide to leave a tip, you'll get access to an organized and properly named node tree. In free version node tree is disguised.
Both share exactly the same functionality!
See features walkthrough here:
This tool is an asset library. To install it just add a path to the folder containg the GSurfaceGen.blend file.
It is important to set Import Method to Append - thanks to it assets will not be added into a scene as instances, so you'll be able to use them as many times as you wish without problems.
Once done succesfully you'll find GSurface Gen primitives in the asset browser: