Since the official T-Splines page redirects to Fusion 360, finding the legacy build requires effort.

Note: Autodesk T-Splines for Rhino is officially end-of-life, and support for it has ceased. However, users with existing licenses often seek the v4.0.r11183 installer for legacy projects.

If you search for "t-splines - v.4.0.r11183 download" on generic download portals, you will encounter significant risks:

Once you have obtained the installer, follow these steps precisely:

If you are trying to manage legacy files, let me know you are currently running and what type of products you are designing so I can suggest the best migration path. Share public link

After installation, you can launch T-Splines v.4.0.r11183 and start exploring its features. Here's a brief guide to get you started:

Use the tsWeld command frequently to close gaps in your model, ensuring it remains watertight. Conclusion

v4.0 offers improved stability and faster performance over previous versions.