Need advice on how to use apton cd iso or cd packages

How to use apton cd iso or apt on cd packages as such without using internet connection to install programs and libraries even when off line?. when ever i run a script in terminal to install packages the it connects to internet and if it not available it say there is duplicate entry in apt oncd. So I have changed the repositories as shown in this explainer video and added apton cd still ubuntu terminal or even synaptic package manager wants internet.

what was the use then to write aptoncd on cd. any hopes?