The iTunes has an invalid signature error is a common issue for this program, which usually happen when your computer fails to detect the digital signature for the application downloading. To fix this issue, the article on MiniTool Website will give you a guide.

iTunes Has an Invalid Signature

iTunes is software program, still available on Windows and older Mac operating systems, designed as a media player, media library, mobile device management utility, and the client app for the iTunes Store.

But iTunes as an app won't exist on the new Mac operating system, but you'll still be able to buy music from the iTunes Store, on the sidebar in the new Music app.

When you try to download or update some programs, your computer might fail to identify the digital signature that is used to authenticate the applications to protect the users from virus or malware, and then the invalid digital signature on iTunes will happen.

You can get rid of this error by changing some settings or update iTunes software. For detailed information, you can go to the next part.

Fix the iTunes Has an Invalid Signature Error

Fix 1: Change Security Settings

If the downloading is outdated or invalid, the iTunes has an invalid signature error will pop out to stop the process. If you need that version downloaded, you can change some settings to enable it.

Step 1: Open the Run dialogue box by pressing the Windows and R keys and input inetcpl.cpl to enter.

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

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

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

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Fix 2: Repair the Apple Software Update Tool

You can repair Apple Software Update that automatically installed in your computer once you have installed any of Apple products.

Step 1: Input appwiz.cpl in your Run dialogue box to enter.

Step 2: Locate Apple Software Update from the list and right-click on it.

Step 3: Choose Repair from the drop-down menu.

Wait for a while until the repair process finishes. Then you can restart your computer and try to check for updates in iTunes again.

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Fix 3: Uninstall and Reinstall iTunes

If the above methods are useless, you can uninstall iTunes and then reinstall the latest version to fix iTunes invalid signature.

Step 1: Type appwiz.cpl in your Run dialogue box and click Enter.

Step 2: You need to uninstall a couple of programs as follows. You’d better restart your computer every time when you uninstall one of them.

  • iTunes
  • Apple Software Update
  • Apple Mobile Device Support
  • Bonjour
  • Apple Application Support 32-bit
  • Apple Application Support 64-bit

Then your iTunes will be uninstalled. To make sure the related files are completely cleared, you need to delete the following folders if they exist in C:/Program Files.

  • iTunes
  • Bonjour
  • iPod

Then delete folders in C:/Program Files/Common Files/Apple.

  • Mobile Device Support
  • Apple Application Support
  • CoreFP

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

Finish the above steps and go to your Recycle Bin and empty the above deleted folders.

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

Note: Make sure that you download the correct version of the application.

Then you can follow the instruction on the screen to install iTunes.

Bottom Line:

When you encountered the “iTunes has an invalid signature” error, you can follow the above methods to get rid of that. Hope this article is useful for you.

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