Sir, as per link provided by you I have successfully installed the latest version of the eSim but didn't get the lm_741 in the library starting from eSim as per the direction is given. Therefore in place of that, I have selected LM741 available in Linear. With this selection, I had successfully generated the netlist but the problem is in the simulation part. When I am trying to generate the kicad to ngspice-3 it shows a message that "Your schematic contains unknown model lm741". So now what we do. Please provide a solution.