How to Install a Snow Leopard 10.6.4 Update on a MacBook Pro
- 1). Click the "Apple" logo in the top of the screen and then select "Software Update." Software Update will search for the latest updates.
- 2). Click "Continue" if Software Update detects updates for your computer.
- 3). Remove the check marks from any updates in the Update window that you do not want to install. Then click "Install."
- 4). Enter your administrator password if prompted and then click "OK" to begin the installation. Wait while your computer downloads, installs and configures the updates.
- 5). Click "Restart Now" to restart your computer if prompted. Once the computer restarts, the operating system may continue to format the installed updates. Once the computer restarts, the updating process is complete.
Source...