If you are attempting to run this legacy software today, you must ensure compatibility with your specific version of Rhino (usually Rhino 5) and your operating system.

The core appeal of T-Splines 3.5 was its ability to allow "watertight" modeling. Traditional NURBS modeling (the foundation of Rhino) often suffers from "rectangular topology" constraints, leading to seams and complex patching. T-Splines introduced

The keyword specifically mentions "Matrix." For those in the jewelry industry, (developed by Gemvision, now owned by Stuller) is a specialized CAD solution built on top of Rhino.

For many users who learned 3D modeling in the early 2010s, version 3.5 represents the peak of the standalone workflow. Even today, many experienced jewelers prefer the specific toolset and hotkeys of T-Splines 3.5 over modern alternatives, simply because it is what they are fastest on.