1) Go to Back >> Settings >> Change browser to Network
2) Go To Terminal >> Edit >> Add KOT and Receipt Template.
Here we have add printer name and ip address of your system.
3) Run & Install file using below link
4) After installation of above file, You will see printer icon.
Right Click on printer Icon >> Settings >> Enter Optimus code.
5) Go to front end. Open new tab and type IP address along with port number 8006 (Example:- 127.0.0.1:8006)
This will help you to check whether print service has started on your system or not. Refer below screenshot.