You can download the latest version from the i Tunes website.
Once downloaded, simply run the installation package to see if it fixes your problem.
Every time Apple releases an i Tunes update, it adds cool new features, crucial bug fixes, and support for new i Phones, i Pads, and other devices that use i Tunes. The easiest way to upgrade i Tunes requires you to do almost nothing.
Because of that, you should almost always update to the latest and greatest version as soon as you can. That's because i Tunes automatically notifies you when a new version is released.
If you've upgraded i Tunes and don't like it, you may want to go back to the previous one.
Learn more about that in Can You Downgrade From i Tunes Updates?
However, there can be instances when this feature isn't available.
The main pattern is an error prompt, that abruptly stops the update process, claiming “Rent once, watch anywhere.
If you are looking for an alternative to i Tunes, I recommend Tenorshare i Care Fone - which features i OS data transfer, backup & restore, i Phone cleaning and tuneup as well as i OS problems fixing.
By default, the i Tunes software automatically checks for updates every time the program is run.
In that case, a pop-up window announcing the upgrade appears when you launch i Tunes.
If you see that window and want to upgrade, just follow the onscreen instructions and you'll be running the i Tunes in no time.