
If version of component for Joomla 2.5 not work or you have Deprecated error in:  
plugins\content\mailorder\mailorder.php on line 122


just change this line 122 from:
return $this->onContentBeforeDisplay($context, &$row, &$params, $page);
 
to:
return $this->onContentBeforeDisplay($context, $row, $params, $page);