Ganz am Ende der Datei, jedoch noch vor ?> einfgen:

if (defined('MODULE_PROTECTEDSHOPS_STATUS') && MODULE_PROTECTEDSHOPS_STATUS == 'true') {
  require_once(DIR_FS_CATALOG.'includes/external/protectedshops/protectedshops_update.php');
  $protectedshops = new protectedshops_update();
  $protectedshops->check_update();
}
