Mac OS X 10.5.2 Update
Apple released the much-anticipated Mac OS X 10.5.2 update, which includes general operating system improvements that enhance the stability, compatibility, and security on the Mac.
The Mac OS X 10.5.2 update is recommended for all users running Mac OS X 10.5 or 10.5.1 Leopard. It is also recommended that you back up your system before installing the update.
To install the Mac OS X update users can use Software Update or the standalone installer.
To use the Software Update:
Choose Software Update from the Apple menu to automatically check for the latest Apple software using the Internet, including this update. The size of the Mac OS X 10.5.2 update is approximately 350MB.