iTunes Invalid Signature Error: Fix Guide

iTunes Invalid Signature Errors are a common problem with iTunes and usually occur when the computer cannot recognize the digital signature downloaded by the application. This article provides detailed steps to resolve this issue.

What is the role of iTunes

iTunes is a media player, media library, mobile device management utility, and client application for the iTunes Store that is available on Windows and older Mac operating systems. The new Mac operating system no longer includes the iTunes app, but you can still purchase music through the iTunes Store in the sidebar of the new music app.

Cause of invalid signature error

When you try to download or update certain programs, your computer may not recognize the digital signature used to verify the application, resulting in an invalid digital signature error. This signature is used to protect users from viruses or malware.

Solution

You can resolve this error by changing certain settings or updating the iTunes software. The following provide several solutions:

Method 1: Change security settings

If the downloaded iTunes version is expired or invalid, an "Invalid Signature" error will pop up to prevent the download process. If you need to download the version, you can change some settings to enable it.

Step 1: Press the Windows key and R key to open the Run dialog box, enter inetcpl.cpl and press Enter.

Step 2: In the Advanced tab, under the Security category, select the "Allow software to run or install even if the signature is invalid" option.

Step 3: Click Apply to save the changes and restart the computer.

Try to update iTunes again to see if the error still exists.

Method 2: Fix Apple Software Update Tool

If you have any Apple products installed, the Apple Software Update Tool will be automatically installed on your computer. You can try to fix this tool.

Step 1: Enter appwiz.cpl in the Run dialog box and press Enter.

Step 2: Find "Apple Software Update" in the list and right-click it.

Step 3: Select “Fix” from the drop-down menu.

Wait for the repair process to be completed. You can then restart your computer and try again to check for updates in iTunes.

Method 3: Uninstall and reinstall iTunes

If the above method does not work, you can uninstall iTunes and reinstall the latest version.

Step 1: Type appwiz.cpl in the Run dialog box and click Enter.

Step 2: You need to uninstall the following programs. It is recommended to restart the computer after uninstalling one program at a time.

• iTunes
• Apple Software Updates
• Apple Mobile Device Support
• Bonjour
• Apple application support (32-bit)
• Apple application support (64-bit)

After the uninstallation is complete, to ensure that the relevant files are completely cleared, delete the following folder (if it exists in C:/Program Files ):

• iTunes
• Bonjour
• iPod

Then delete the following folders in C:/Program Files/Common Files/Apple :

• Mobile Device Support
• Apple Application Support
• CoreFP

Check the relevant folders in C:/Program Files (x86) and C:/Program Files (x86)/Common Files and delete the iTunes-related folders.

After completing the above steps, clear the recycling bin.

Step 3: Visit the official iTunes download website to download the latest version.

Note: Then follow the on-screen instructions to install iTunes.

Summarize

When you encounter the "iTunes Invalid Signature" error, you can try the above method to resolve the issue. Hope this article helps you.

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