Downloading SketchUp plugins from unauthorized third-party file-sharing sites poses a significant malware risk. Because SketchUp plugins run Ruby scripts directly within your system, you must only source old versions from trusted platforms. 1. The Official SketchUcation Plugin Store
Fredo6 has archived specific versions for older software. The primary "old version" to use for legacy SketchUp (pre-2017) is . Target SU Versions: Pre-8, 2013, 2014, 2015, 2016. Libfredo6 Old Version
The method of validating the "Pro" versions of Fredo6’s plugins has evolved. Libfredo6 Old Version