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How to Repair “iTunes Has an Invalid Signature” Error

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iTunes has been a great iOS management program since Apple’s first device release. It’s great for backing up data, installing apps in batch, and general storage management. But one problem that users encounter is that iTunes has an invalid signature during the installation. This results in the program not installing and therefore, some users can’t get the most out of it. For some users, it means they can’t update the program and access the most recent features. If this is an error that you’ve been encountering recently and you’d like to use iTunes, try out some of these solutions.

What Causes iTunes Has an Invalid Signature?

The first thing we did was investigate the error. By finding out what was causing the error in the first place, we’ve been able to assemble an effective list of possible fixes. After browsing the Apple forums and finding out other users’ experience with the signature error, we got to work. Some of the top reasons can be found below.

  • Older versions of the Windows operating system, including Windows XP, don’t support the latest versions of iTunes.
  • While installing an iTunes update, the computer might not detect an iTunes digital signature. Without this signature, the Windows system isn’t able to verify the authenticity of the iTunes installation so it simply won’t install it.
  • Various Windows security feature may prevent iTunes from installing. Again, this could be due to Windows not being able to find a digital signature.
  • Users sometimes accidentally delete the iTunes installation folder or other Apple folders.

This isn’t to say that you’re seeing iTunes has an invalid signature definitely as a result of one of those issues. Simply, this is what we found during our research. We used this information to analyze the error and come up with reliable solutions.

Fix #1 – Reinstall iTunes

First of all, you should reinstall iTunes on your computer. Since this error usually happens when updating iTunes, a previous version is already there. The updater tool downloads the newest iTunes version to overwrite the files, therefore uninstalling can be a great help. It removes any files that the program no longer requires and generally helps to prevent problems with updating.
Depending on whether you have a Windows or Mac computer, the steps are different. Thus, we split this section into two parts for your convenience.

How to Reinstall iTunes on Windows

If you have a Windows computer, then you can follow these steps to reinstall iTunes.

Step #1 – Press the Windows key on your keyboard to open up the search bar.

Step #2 – In the search bar, type “Control Panel” and click on the app that appears.


Step #3 – Under the “Programs” header, go ahead and select “Uninstall a Program”.


Step #4 – You’ll now be able to see a list of all the programs which you have on your computer. Scroll down and locate “iTunes” from the list.

Step #5 – Click on “iTunes” and then click on the “Uninstall” button at the top of the window.

Step #6 – Verify that you want to uninstall iTunes and follow the uninstall guide on-screen.

You should now proceed to use this same process to uninstall the following Apple software components:

  • Apple Application Support (32 bit & 64 bit)
  • Apple Mobile Device Support
  • And Apple Software Update
  • Bonjour

Step #7 – After completely uninstalling all Apple components, restart your computer.

Step #8 – Download iTunes from the Apple website and install a fresh copy of the program.

Even though this will likely cause you to lose your library and other iTunes data, a fresh install can be incredibly useful.

How to Reinstall iTunes on Mac

Alternatively, if you have a Mac computer, follow the steps below to reinstall iTunes.

Step #1 – From the Finder menu, click on “Go” and then select “Applications”.

Step #2 – Click on the iTunes app logo to open the program.

Step #3 – At the top of iTunes, select the “File” drop-down menu and then on “Get Info”.

Step #4 – Next, click on the tab “Sharing Permissions” and then you must click the lock icon, which can be found at the bottom-right.


Step #5 – If prompted, type in your computer’s administrator password to proceed. Next to the “everyone” entry, select the option “Read & Write”.

Step #6 – Exit iTunes and then back on the “Applications” menu, drag the iTunes logo into your trash.

Step #7 – You may now restart your Mac computer, but this isn’t necessary. Now simply download and reinstall iTunes on your computer.

As we said before, this will delete your iTunes library. That said, it’s great to do this every once in a while, and if you keep seeing “iTunes has an invalid signature” then this might prevent it from happening again.


Fix #2 – iMyFone TunesFix

Another fix for iTunes problems is to use iMyFone TunesFix. This third-party tool is one of the best iTunes repair solutions out there. Here are some of the key features that you’ll get to enjoy:

There’s a free version of iMyFone TunesFix available, meaning that you can fix iTunes has an invalid signature without buying a copy. Before following either of the guides below, download and install the program so that it is ready for use.

Download iMyfone TunesFix (Windows Version)

Repair iTunes with iMyFone TunesFix

For this first solution with iMyFone TunesFix, we’ll walk you through repairing iTunes.

Step #1 – Launch iMyFone TunesFix and a short scan will be run.

Step #2 – The program will detect that there is a problem with your iTunes installation. Click on the “Repair” button to proceed.


Step #3 – If no errors are found then you’ll be sent to the main menu. From here, select “Fix iTunes Install/Update Issues”.


Step #4 – On the next page, read the short briefing and then click on “Repair”.

These repairs will take no more than 5 minutes, but usually, it takes a lot less time. If this doesn’t help you, then try the next set of steps instead.

Uninstall iTunes iMyFone TunesFix

Another possible fix to ‘iTunes has an invalid signature’ is to uninstall it using iMyFone TunesFix completely.

Step #1 – Open iMyFone TunesFix and if no issues are found, you’ll be taken straight to the program’s main menu.

Step #2 – From the options that you see, go ahead and click on the “Full Uninstall” feature.


Step #3 – On the screen which appears, you’ll be given a choice to delete user data. This isn’t necessary by any means, although doing so provides you with a completely fresh installation.

Step #4 – After you decide whether or not to delete user data, click on the “Uninstall” button.

With iTunes completely gone from your computer, you can install a fresh version of the program. We are confident that using a combination of iMyFone TunesFix features will fix the error and give you full access to iTunes again.


Fix #3 – Changing Windows Security Settings

For this final solution, we will be recommending that users adjust their Windows security settings. The reason for us suggesting this is simply that we found a direct connection with the signature error and Windows security settings.

However, be aware that you must change these settings back after you fix iTunes to prevent security vulnerabilities.

Step #1 – On your keyboard, press the Windows key and R simultaneously.

Step #2 – When the “Run” box appears, enter “inetcpl.cpl” and hit the Enter key.

Step #3 – From the menu that now appears, check the box of the option “Allow software to run or install even if the signature is invalid”, and click “Apply”.

Step #4 – Restart your computer and then go ahead to open iTunes.

Step #5 – Click on “Help” on the top menu, and then “Check for Update”.

Step #6 – iTunes should now successfully update to the most recent version that is available.

Again, please remember to revert these security changes after following the steps above. Now that you’ve tried all of the methods that we recommend, this will hopefully eliminate whatever iTunes errors you’ve had to deal with.

To conclude on ‘iTunes has an invalid signature’

Keeping your iOS version up to date is important, but your iTunes version is just as important. If you find the iTunes has an invalid signature error to be bothersome then consider the fixes above, especially using iMyFone TunesFix. One of the best things about this program is that it can repair virtually every iTunes problem without losing your personal data in the process. While backing up your personal data is important, with this tool it isn’t necessary!

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