: On SketchUcation , these legacy files are explicitly labeled with a "Prior_2017" prefix to distinguish them from modern, paid versions.
Installing an old version of LibFredo6 follows a slightly different path depending on your SketchUp version: LibFredo6 - SketchUp Extension Warehouse Libfredo6 Old Version
This is the most practical section. Below is a compatibility matrix based on community testing. : On SketchUcation , these legacy files are