ITunes is a very powerful software. ITunes itself can be used as a music video player to play music and videos, but in addition to entertainment functions, iTunes can also be used to back up Apple mobile phone data. But any software will be updated regularly, and many software system updates often fail. Today, Bian Xiao will teach you how to solve the problem that itunes update system failed.

By default, Itunes automatically detects updates. Click Install this item, as shown in the figure below.

There will be an error after downloading and installing. Click Yes, as shown in the figure below.

Return to the update and click Tools, as shown in the figure below.

Click Download Only under Tools. As shown in the following figure

The system starts to download automatically, as shown in the figure below.

After downloading, you can right-click to run as an administrator, as shown in the following figure.

If the signature is invalid after downloading and installing, look down, as shown below.

Then we can only download it from official website, and don't use automatic update, and then install it manually! As shown in the following figure