Always respect software licensing. The best download is the legal download. Have you used T-Splines v.4.0.r11183 recently? Share your legacy workflows in the comments below. If you found this guide helpful, check out our comparison chart: NURBS vs. SubD vs. T-Splines.
Then came T-Splines.
If you hold a valid license, retrieve your installer from Autodesk archives or your backup drives. If you are starting a new project today, however, invest the time in learning Rhino’s SubD tools—they are the legitimate, supported evolution of the T-Splines dream. t-splines - v.4.0.r11183 download