Mac OS X 10.6: Updating your software
Periodically, Apple releases free updates to your computer’s software. You can check for updates manually or set your computer to check for updates automatically. These updates include important security updates that protect your computer from potential threats.
In most cases, you must have an Internet connection to receive software updates. If you work on a managed network, software updates may be provided by a network server.
To check for updates manually:
Choose Apple menu > Software Update. The Software Update window opens. If there are any updates available, they appear in a list.
Click the checkboxes to select the items you want to install, and then click Install. Type an administrator name and password (the name and password you used when you first set up your computer).
When the installation is complete, Software Update checks for updates again. It does this because some updates require that you have installed previous updates.
To set your computer to check for updates automatically:
Choose Apple menu > System Preferences, click Software Update, and then click Scheduled Check.
Select the “Check for updates” checkbox, and then choose Daily, Weekly, or Monthly from the pop-up menu.
If you want your computer to download important updates without asking, select “Download updates automatically.” When the update finishes downloading, you will be notified that it is ready to be installed.
When your computer detects that an update is available, you can choose to download and install the update or ignore it. Your computer will not check for updates if it’s turned off during the time it’s scheduled to automatically check.