Once installed, you'll find iTunes in your Applications folder.

Connect your iPhone, iPad, or iPod via USB. Open a Finder window and select your device from the sidebar to access backup, restore, and syncing options identical to the historical iTunes interface.

Published Date: March 08, 2024. Apple Footer.  Support. Download iTunes 12.8.3 for Mac. Apple Support Download iTunes for Mac | MacUpdate

: Apple officially replaced iTunes with separate apps (Music, TV, and Podcasts) starting with macOS Catalina (10.15) in 2019.

You are likely trying to install classic iTunes on macOS Catalina (10.15), Big Sur (11.0), Monterey (12.0), Ventura (13.0), Sonoma (14.0), or Sequoia (15.0).

Follow the on-screen prompts to complete the installation.

Apple’s official version numbering for iTunes never actually reached a "10.13.9.9" sequence. concluded its lifecycle around version 10.7.

The Ultimate Guide to Downloading iTunes 12.8 for Mac: Requirements, Features, and Fixes