You will find “SubD” by MindSight Studios. Click on it.
Here is the safe, step-by-step process to get a genuine license key: Sketchup Subd License Key
Many users confuse the old, free "SubD" (from around SketchUp 2015) with the modern "Subd." The legacy version is no longer supported, crashes on recent SketchUp versions (2020+), and lacks critical features like creasing. Do not rely on it for professional work. You will find “SubD” by MindSight Studios