iTunes conveniently updates automatically when new software versions are released. As the saying goes, some users may want to manually update for one reason or another. Skip to Step 1 to learn how to manually update the software through iTunes.
Steps

Step 1. Open iTunes
Double click on the iTunes icon on your desktop.

Step 2. Open Help
On the menu bar, at the top of the iTunes window, click on “Help.”

Step 3. Click on Check for Updates
In the Help menu, scroll down and click on “Check for Updates.” iTunes should determine if your version of iTunes is the latest or not.