After generating net file then go to the footprint editor tool but components not available for selection
After generating net file, when u click on footprint editor than a pop-up appears of of yes and no. you have to click on NO than only the components will appear for selection.
Please use updated version of eSim and still if you facing the problem then you mail the example to us we will solve for you.
If you are only designing the PCB then you can directly use the Kicad software.(details for PCB design visit this link http://kicad-pcb.org/)
To Contact us - http://esim.fossee.in/contact-us
I would also like to say that the better to do is to use updated version.