SUbD is a parametric subdivision extension for SketchUp that allows users to create smooth, complex shapes from simple, low-poly meshes. Using the Catmull-Clark algorithm, it subdivides faces and creases edges to produce organic geometry like furniture, vehicles, and characters. It is highly optimized for quad-based workflows and works best when paired with the free extension. Official Pricing & How to Get a License Key
For users looking to do Subdivision modeling in SketchUp, some popular plugins include:
Using pirated or unauthorized keys violates the developer's terms of service and does not support the continued development of the tool.