T-NEURO is distributed with a separate installer. The installer can be downloaded from the same download page of Sim4Life.
Please note that the installer must point to the exact same folder where Sim4Life (or Sim4Life lite) is installed, i.e., C:\Program Files\Sim4Life_v5.0.x.xxxx
Only after this step will you be able to execute the Load Model function and subsequently be able to place line and point sensors and run the simulation.