There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor.First, you may diagnose which Apple program is the root that cause the error by uninstalling all Apple programs in Control Panel. In my case, I was unable to uninstall Apple Software Update because a file called AppleSoftwareUpdate.msi is missing.
To fix it, click Repair button. If it still doesn't work, you have to workaround in the Windows Registry Editor (Regedit) as below:
- Press Windows key + r and run Regedit.
- Click Edit and Find...
- Type applesoftwareupdate.msi and start the search.
- In the left pane of Regedit, right click the Shell Folder of Apple Software Update and click Delete.
- Install iTunes 12.3. The iTunes installer will re-install all the required software successfully.