PHP expert required to add Demo Importer in our wordpress theme

PHP expert our theme have Radium Demo importer we want to switch to One click demo importer all code you have to modify like in short our theme is working fine but in importer the code is class Radium_Theme_Demo_Data_Importer extends Radium_Theme_Importer { private static $instance; public $download_content_attachments = true; public $contents_file_name = '[login to view URL]'; public $theme_options_file_name = '[login to view URL]'; public $theme_option_name = 'theme_mods_creativo'; public $widgets_file_name = '[login to view URL]'; public $revsliders_file_name = '[login to view URL]'; public $revsliders_file_name2 = '[login to view URL]'; public $layersliders_file_name = '[login to view URL]'; // Base demo files folder to download from public $demo_zips_url_base = '[login to view URL]'; public $widget_import_results; public function __construct() { self::$instance = $this; add_filter( 'add_post_metadata', array( $this, 'check_previous_meta' ), 10, 5 ); add_action( 'radium_after_content_import', array( $this, 'setup_default_pages' ) ); //self::setup_default_pages(); add_action( 'admin_menu', array( $this, 'add_admin_menu') ); add_action( 'wp_ajax_radium_demo_import', array( $this, 'demo_import_ajax') ); add_action( 'wp_ajax_radium_demo_menu', array( $this, 'setup_menus_locations') ); } above code is defining the address of file to be downloaded please help us to break this code in simple format like how to upload zip files in server how importer will download those zip from server and unzip it if still dont understand Inbox anything you like to ask i can share you the photo and more details