[Forminator] - Limit the birthday date

forminator-limit-the-date-of-birth.php

<?php
/**
 * Plugin Name: [Forminator] - Limit the date of birth
 * Description: [Forminator] - Limit the date of birth
 * Task: 0/11289012348292/1172860968808076
 * Author: Thobk @ WPMUDEV
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */
if ( ! defined( 'ABSPATH' ) ) { exit; } elseif ( defined( 'WP_CLI' ) && WP_CLI ) { return; }

add_action( 'after_setup_theme', 'wpmudev_forminator_limit_birthday_date_func', 101 );

function wpmudev_forminator_limit_birthday_date_func() {
	if ( defined('FORMINATOR_PRO') && class_exists( 'Forminator' )  ) {
		add_action( 'wp_footer', 'wpmudev_forminator_limit_birthday_date', 21 );

		function wpmudev_forminator_limit_birthday_date(){
			ob_start();
			?>
			<script>
				(function($){
					$(function(){
						if (typeof ($.fn.forminatorLoader) === 'undefined') {
							// nothing to do here
						} else {
							$(document).on('after.load.forminator', function(e, form_id){
								let _form = $('#forminator-module-'+ form_id),
										_disableMessage = 'This age is restrict!';

								if( _form.length && _form.hasClass('forminator-custom-form') ){
									let _birthday = _form.find('.birthday-date-picker .forminator-datepicker');
									if( _birthday.length ){
										_birthday.datepicker( "option", "maxDate", "-216m" );
										var _old = _birthday.datepicker("option", "beforeShowDay");
										var _max_time = new Date();
										_max_time.setFullYear( _max_time.getFullYear() - 18 );
										_birthday.datepicker( "option", "beforeShowDay", function( current_date ){
											if( current_date > _max_time ){
												return [false, "enabledDate", _disableMessage];
											}else{
												return [true, "enabledDate"];
											}
										});
									}
								}
							});
						}
					});
				})(window.jQuery)
			</script>
			<?php
			echo ob_get_clean();
		}
	}
}

Hi is it possible to give some instructions on how to make this work? Does this works only with Forminator pro ?