Hello does, V 1.5.1 fix the issue with Gift certificates being purchase and not queued?

not entirely what version we have installed, as it was installed before i arrived.
but within the header file it says:
PHP Code:
 * @version $Id: header_php.php 4 2008-07-17 02:59:00Z numinix $ 
but if it does fix this issue is it a complicated upgrade procedure?

regards
Andy.