Version 6.0 was the peak of this "Wild West" era. It had no requirement for a constant internet connection. It didn't check for updates every five seconds. It simply sat in your Tools menu, silent and powerful.
By using the official GitHub archives, understanding the version mapping chart, and following the clean uninstallation process, you can safely run a legacy environment. Libfredo6 Old Version
A Fredo6 plugin fails to load or crashes SketchUp. Version 6
Using an older version of LibFredo6 can sometimes introduce challenges. One of the most common issues occurs when plugins designed for a newer LibFredo6 are run on an older one. When this happens, SketchUp will often display an error message similar to: fredo tools: requires Libfredo6 version >= 120 , indicating that the installed version is too old. It simply sat in your Tools menu, silent and powerful
Software ecosystems change rapidly. There are three primary reasons why modern SketchUp users actively search for older versions of this library: 1. Compatibility with Legacy SketchUp Versions
Check for any startup pop-ups or errors. If successful, you should see a menu under your Extensions or Window top menu bar. Troubleshooting Common Issues
“ArgumentError (invalid byte sequence in UTF-8)”