Getting Started with the 3skeng SketchUp Plugin While 3skeng is a professional-grade engineering extension that requires a paid annual license, you can access a of the full version to test its capabilities. There is currently no permanent free version of the software, as it is sold as a professional tool for MEP (Mechanical, Electrical, and Plumbing) and structural design. How to Access the Free Trial To start your 14-day trial, follow these steps:
Keep in mind that SketchUp Free has some limitations compared to the Pro version, which may affect your use of the 3skeng plugin: 3skeng plugin sketchup free