T-splines - V.4.0.r11183 ((free)) Download
T-Splines v4.0.r11183 is the final release of the Autodesk T-Splines plug-in for Rhinoceros 5. This version represents the technology's peak before it was discontinued as a standalone Rhino plugin and integrated into Autodesk Fusion 360 Key Features of T-Splines v4.0
Method 2: Third-Party Archival Sites (Proceed with Caution)
Version 4.0.r11183
4. The Last Pre-Subscription Model
The "story" for most modern users began in 2017 when Autodesk officially discontinued T-Splines for Rhino. The technology was integrated into Autodesk Fusion 360 , but the standalone plugin was left to wither. T-Splines problem - Rhino for Windows - McNeel Forum t-splines - v.4.0.r11183 download