Download Archive Menu Item

function cor_edd_nav_menu_items_page( $posts ) {

	array_unshift(

		$posts, (object) array(

			'ID'           => 0,

			'object_id'    => - 1,

			'post_content' => '',

			'post_excerpt' => '',

			'post_parent'  => '',

			'post_title'   => get_post_type_object( 'download' )->labels->menu_name,

			'post_type'    => 'nav_menu_item',

			'type'         => 'custom',

			'url'          => get_post_type_archive_link( 'download' ),

		)

	);

	return $posts;

}

add_filter( 'nav_menu_items_page', 'cor_edd_nav_menu_items_page' );