Easy as 123... If your looking to update from Joomla 1.5.23 to 1.5.25 and above Akeeba Admin Tools is exactly what you need to get the job done (considering so many forum posts are asking where the 1.5.23 update package can be found). The component is flawless! BTW - Be sure to use Akeeba back up before upgrading!!!!
Kudos + 5 Stars - to the development staff at Akeeba, Keep up the good work!