Because Trimble structurally overhauled SketchUp's Ruby API backend over time, LibFredo6 versions are strictly split into two generation paths.
A popup on startup stating "LibFredo6 [Version] is required" [3]. libfredo6 old version upd
Go to Extensions > Sketchucation > Extension Store . Search for LibFredo6: Type "LibFredo6" in the search bar. Update: Click the Update button if available. libfredo6 old version upd
If you need an old version, where do you find it? This is a minefield. libfredo6 old version upd
: These require "Legacy" versions. The final archived version for pre-2017 SketchUp is v9.5k . Note that "Check for Updates" is often disabled in these older legacy versions. How to Update Properly