Click and select the LibFredo6 .rbz file first, then repeat for FredoTools.
By downloading the top FredoTools, you can significantly enhance your workflow in SketchUp 2021.
A: Fredo6 does not pay for a digital certificate (they cost $300+ per year). SketchUp 2021 will warn "Unverified Extension." This is normal for free plugins. You can click "Yes" or "Trust."
Quickly reverses the direction of selected curves or edges.