Q: I had a failed Update and an iTunes message box displayed:- "There is a problem with this Windows installer package. A program required for the install to complete could not be run. Contact your support personel or package vendor.

Hello there, RedEd1.

It seems you're having issues with being able to update your iTunes program for your Windows 10 PC. Great job so far with troubleshooting on your own. Keep in mind that uninstalling iTunes and reinstalling must be done in a very specific order to get all features uninstalled. The following Knowledge Base article offers some great, in-depth recommendations for troubleshooting (including a link to the specific steps for uninstalling):

If you can‘t install or update iTunes for Windows​

If you can’t install iTunes on your Windows PC, or if you see “error 2” or "Apple Application Support was not found" after you install the software, follow the steps below in order.

If you see a different error when trying to launch iTunes, learn how to fix unexpected quits or launch issues.

1. Make sure that you're logged in to your computer as an administrator.
   
   If you're not sure if you have an administrator account, learn how to log on as an administrator. You can also refer to your computer's help system, contact your IT department, or visit support.microsoft.com for more help.
   
   
2. Install the latest Microsoft Windows updates.
   
   To download the latest updates, visit the Microsoft Windows Update website. iTunes for Windows requires Windows 7 or later, with the latest Service Pack installed. If you can’t install the updates, refer to your computer's help system, contact your IT department, or visit support.microsoft.com for more help.
   
   
3. Download the latest supported version of iTunes for your PC from one of the links below. After you click the link, click Download to download the iTunes installer. When prompted, click Save (instead of Run). iTunes 12.1.3 is the latest version of iTunes supported for Windows XP and Vista.
   Windows 7 or later
   iTunes 12.1.3 for Windows XP and Windows Vista 32-bit
   iTunes 12.1.3 for Windows Vista 64-bit
   
   
4. Right click on iTunesSetup or iTunes6464Setup (the installer you downloaded in step 3).
   
   If you have Windows Vista or later: Choose "Run as administrator."
   If you have Windows XP: Choose Open.
   
   If you've previously installed iTunes, the installer will prompt you to repair the software.
   
   After the repair is complete, restart your computer and try launching iTunes.
   
   
5. If iTunes fails to install or repair, it might be necessary to remove components left from a previous installation of iTunes and then reinstall.
   
   Remove and reinstall iTunes and other software components for Windows Vista or later.
   
   Songs you bought from the iTunes Store or imported from CDs are saved in your My Music folder by default. Deleting iTunes won’t delete your music.
   
   
6. Disable conflicting software.
   
   Some background processes can cause issues that prevent applications like iTunes from installing.
   
   If you installed security software and are having issues installing iTunes for Windows, you might need to disable or uninstall security software to resolve the issues.
   
   
7. Restart your computer.
   
8. After the restart, and adjusting the software running on your PC, install iTunes again.

Get more help

If the steps in this article don't help you fix the issue, you might be able to find a solution through a search of the Microsoft support website.

Thanks for reaching out to Apple Support Communities.

Kind Regards.