Sketchup Pro 2018 -

You’ll miss out on the newer "Flip" tool, "Search" bar, and Revit import capabilities found in modern versions. How to Get the Most Out of Your 2018 License

While Solid Tools existed before (Union, Subtract, Intersect), the 2018 version introduced better error reporting. If a boolean operation failed, the software now told you why —specifically which edges were non-manifold or inverted faces. sketchup pro 2018