Pop Up with Custom Page type

Please, check if your file footer.php or theme has the hook wp_footer

Thank you! It does not. Is there a way to adapt a hook for my footer, that is less broad and only gets me the pop up without all the other main theme related content???

Sorry, but it’s not possible.
The plugin works via wp_footer hook

or is it possible to filter the wp_footer only for the popup plugin functions?

You can use the function wp_deregister_style() and wp_deregister_script() for disable styles and scripts.
For example:

add_action( 'init', 'remove_styles_scripts', 99 );

function remove_styles_scripts() {

	wp_deregister_style( 'my_style' );
        wp_deregister_script('fc-script');
}