: If you are using an older operating system or a version of SketchUp like SU8 , modern LibFredo6 versions (which now support SU2017+) will likely fail to load.

Because Libfredo6 is highly sought after, untrustworthy software aggregation websites bundle old versions with malware, adware, or outdated scripts that can corrupt your SketchUp user preferences. Dependency Mismatches

Download the correct old version of LibFredo6 (it will be a .rbz file). Open SketchUp.

For specific troubleshooting, historical versions are often referenced on the SketchUcation Community forums :

Does anyone still have access to an , like v10.x or v12.x? Specifically, I’m looking for the last version that works smoothly with:

If you still have a LibFredo6_v6.0.rb file on a USB stick somewhere, don't throw it away. Mount it on a virtual machine running Windows 7 and SketchUp 2015. You’ll be the only person on earth who can edit that specific historic file without breaking the normals.

If the specific sub-version you need is hidden, you can request access to the legacy archive file by posting a polite message in the dedicated Fredo6 support forum thread. Step-by-Step Installation Guide for Older Versions

If you install an old version and see a popup error upon startup, check the following:

Fredo6 plugins - LEGACY versions prior SU2017 | sketchucation

Libfredo6 is not a tool that creates geometry itself. Instead, it acts as a translation layer. When you install RoundCorner, it checks for Libfredo6. Without it, the plugin fails to load. The library handles: