The first few links led to dead ends. Cracked versions from shady forums? No thanks. Then he found it: the official 3skeng website had a section labeled
3skeng is a free plugin for SketchUp that enables users to create advanced, parametric models and animations. Developed by Skeng, a well-known SketchUp plugin developer, 3skeng extends SketchUp's capabilities, making it a powerful tool for architects, designers, engineers, and artists. 3skeng plugin sketchup free
3skeng offers a Free Viewer/Student Mode and a Free Trial . The first few links led to dead ends