Mac OS X users can set their system preferences to automatically check
for software updates at regular intervals. This feature allows you to
easily download and install security patches and bug fixes. Here are the
steps for enabling automatic checking for software updates:
Double-click the System Preferences icon. System
Preferences in located in the Applications folder on your hard
drive.

The System Preferences window will open.

Click once on the Software Update icon.

The Software Update window will appear. Click once on the
Update Software button.
Place a check next to Check for updates and set the
drop-down menu to either Daily, Weekly, or
Monthly.

Automatic checking for updates is now enabled.
To check if any updates are available immediately, click the
Check Now button.
When updates are available, Software Update will
automatically launch itself and begin searching for updates. A list of
updates that are available will appear. Place a check next to those you
wish to install and then click the Install button. Some updates
may require that you restart the computer.