Apple has just released an update for Mac OS X Leopard which fixes nearly 40 issues related to the operating system.

The Mac OS X 10.5.6 is available as a 373MB download for Macs running Mac OS X 10.5.5 and a 668MB download for Macs previous versions of the operating system.

The sixth update to Mac OS X 10.5 Leopard, released in 2007, brings the standard tweaks, bug fixes, as well as security improvements. It has improved reliability of Time Machine with Time Capsule and, additionally, it has enhanced printing under CS3 and enhanced printing for users of USB-based Brother and Canon printers.

Besides, the update offers DVD player performance improvements, graphical improvements, in addition to an original Trackpad panel in System Preferences for portable Macs.

Moreover, Mac OS X 10.5.6 includes all the security improvements included with Security Update 2008-008. One can install the aforementioned update either from using the Software Update or from the company’s Web site. However, delta and combo installers are available as a different download.

According to Apple’s Support Page, people should take into account several installment related recommendations, such as backing up their computer before installing any updates, quitting any open applications before starting the installation and avoiding the interruption of the installation process.