It is critical to avoid unofficial "mirror" sites which may package plugins with malware. The developer has officially archived legacy versions for users of older software. LibFredo6 - SketchUcation
Some older, unmaintained plugins may only function with the specific library environment provided by earlier LibFredo6 builds. Where to Safely Download Old Versions Libfredo6 Old Version
The primary reason for seeking older versions is the shift in SketchUp’s framework. Starting with , the library only supports SketchUp 2017 and newer . It is critical to avoid unofficial "mirror" sites
These versions are no longer supported by modern LibFredo6 updates. Libfredo6 Old Version
Older versions of the library are sometimes preferred for high-resolution screen adjustments in SketchUp 2016, where manual scaling (often a factor of 2) is required.