Selection Screen for Simple and Advanced Installation

GConverter has a rather wize choice on its first screen: Simple Installation and Advanced option.

The question is how to make such screen and how to develop such installation further.

My guess is that user-made choice to be saved in some variable and further checked for each step.

Are there any example for such project?

Thank you in advance.

Kind regards,

There is no dialog box to show the same buttons as in the GConvert setup. But this can be made with option boxes for instance (Ask user for a single choice custom action).
You store the result in a variable and use a Goto action to avoid next configuration pages for instance.