NDI is built-in, although *I think* that if you want to receive NDI|HX from the PTZ1 camera or Connect Spark, then you need to install the NDI|HX codec from website onto TriCaster. Regular NDI works without that install.
For testing purposes, run the free NDI Scan Converter on a Windows 8 or 10 PC on same network as TC, or use NDI Test Patterns. Or both. They should show up under Input Configure options on TC (right-click any button on Program Row). NDI is FUN, try it out!
Also, your TC460AE is going to automatically output several channels of NDI! Any connected camera input 1-4 is instantly available across the network as an NDI source, and output MIX 1-4 are also available. Run the free NDI Studio Monitor software on a PC and you ought to be able to see the Program output of TriCaster full-quality, full-screen, as well as any other NDI source from the 460.
Download free NDI TOOLS for PC or Mac on this page -
https://www.newtek.com/ndi/tools/
Thanks
Jeff