Before SketchUp modernized its API regarding toolbars and UI, LibFredo6 managed complex dialog generation manually.

Even with a correct Libfredo6 old version, you can encounter errors. Here is the fix for the top three issues.

Most users search for a Libfredo6 old version for three specific reasons:

This is the most practical section. Below is a compatibility matrix based on community testing.

| Libfredo6 Version | Best for SketchUp Version | Compatible With (Examples) | Notes | | :--- | :--- | :--- | :--- | | v6.2 | SketchUp 2015 – 2016 | Curviloft 1.7, JointPushPull 2.x | Last version without the modern UI (Report Browser). | | v8.5a | SketchUp 2017 – 2019 | FredoTools 3.3a, RoundCorner 2.0 | The "Workhorse" – Most stable for pre-2020 workflows. | | v10.7 | SketchUp 2020 – 2021 | FredoScale 3.0, TopoShaper 2.0 | Introduces dark mode compatibility. | | v12.0c | SketchUp 2022 – 2023 | All Fredo6 plugins up to 2024 | Fixed a major memory leak from v11. | | v13.0+ | SketchUp 2024+ | Only the latest plugin versions | Warning: Do not use v13+ with plugins last updated in 2020. |

Pro Tip: If you don’t know which version you need, start with v8.5a. It is the most backward-compatible release that still runs on modern hardware.