To download iTunes for your on a computer, you should generally aim for . While newer versions of iTunes are typically backward compatible with older devices like the 4s, the specific version you need may depend on which iOS your phone is running. Recommended Versions for iPhone 4s

: If you are using an older PC with a low-end video card, Apple provides a special version, iTunes 12.4.3 , specifically designed for older hardware. How to Download

: You need at least iTunes 10.5 to recognize and sync an For iOS 9 users : If your

System Requirements * Apple ID (required for some features) * Internet access5 * Syncing with iTunes on a Mac or PC requires: Mac: Apple Support

is updated to its maximum firmware (iOS 9.3.5/9.3.6), it is recommended to use at least for full compatibility.

You can find the official installers on the page. iPhone 4S - Technical Specifications - Apple Support