If you are using a legacy version of SketchUp, you may require specific older builds:
These versions are no longer supported by modern LibFredo6 updates. Libfredo6 Old Version
Some older, unmaintained plugins may only function with the specific library environment provided by earlier LibFredo6 builds. Where to Safely Download Old Versions If you are using a legacy version of
The primary reason for seeking older versions is the shift in SketchUp’s framework. Starting with , the library only supports SketchUp 2017 and newer . Libfredo6 Old Version