iTunes Technical Support
Click on the link relevant to your concern:
Can't connect to the iTunes Store?
iTunes for Windows 10.2 Help
iTunes Mac 10.2 Help
How to install iTunes on 64-bit editions of Windows Vista
Troubleshooting iTunes installation on Mac OS X
iTunes 7 or later for Windows Installation stops responding while "Registering Modules"
Interrupted Downloads Issues
iOS: Troubleshooting Wi-Fi networks and connections
Using the iTunes Store for iPhone, iPad, and iPod touch
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