Manual Updates

Press the "Alt" key to display the menu bar at the top of the iTunes window, where you can click "Help," then "Check for Updates." If any updates are available, follow the prompts to install them. If your iTunes version is up to date, a window displays your current version.

Automatic Updates

To enable automatic updates, press the "Alt" key to display the menu bar, and then click "Edit," followed by "Preferences." Under the Advanced tab is the option "Check for new software updates automatically." Once selected, iTunes will update itself in the future without prompting or alerting you.