It seems as though some users have issue installing or updating iTunes. Here we list the common iTunes installation errors and also the corresponding workarounds.
You may receive one of the following error messages when updating or installing iTunes for Windows:
"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."
"There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor."
This iTunes install error is not strange to some users who came across the same iTunes 12.6/12.5/12.3 installation error on Windows 10. The most common cause of the errors is outdated or incompatible version of Apple Software Update on the PC. To fix this issue, follow these steps.
"I am running W7 64-bit. Every time I try to install ITune I get an Error 7 (Windows error 193) upon completion ( and another pop up that says 'iTunes helper was not installed'). During the installation process I get a message that Apple Mobile Device Service was unable to start. To which I select 'Ignore'"
This is another error message that occurs during iTunes installation. You can follow the steps to resolve this error.
1. Head to C:\Windows\System32
2. Locate the following files and remove them to Recycle Bin.
Make sure that the file names that you drag to the recycle bin match those above exactly. If you cannot locate a file, skip and go to the next file. Any other files should not be removed from this folder.
3. After you drag these files to Recycle Bin, go and perform a repair on both installed versions of Apple Application Support (64 and 32-bit) in the Add/Remove Programs list in the Control Panel. iTunes requires both 64 and 32-bit versions of Apple Application Support.
4. Launch iTunes. If iTunes won't launch and you see the error 7 (Windows error 193) again, you should reinstall iTunes again.
If iTunes won't install on Windows 10/8.1/8/7 with the error "Apple application support was not found (Windows error 2)", you can correct this issue through uninstalling all Apple components and reinstalling iTunes. There may be an answer here: https://support.apple.com/en-gb/HT201668
If the aforementioned methods didn't work for you, you can try Tenorshare TunesCare, which is a FREE and professional iTunes repair tool, can easily solve all iTunes issues within a couple of clicks.
So, we summarize the most common error messages during iTunes installing and updating. Hope these tricks help when you cannot install or update iTunes. As a matter of fact, iTunes is a complex program that many iOS users are not prefer. Using iTunes for iOS data syncing and transferring is complicated and time-consuming. If you are looking for an alternative to iTunes, I recommend iCareFone - which features iOS data transfer, backup & restore, iPhone cleaning and tuneup as well as iOS problems fixing.