Starting with macOS Catalina in 2019, Apple discontinued iTunes as a single application and replaced it with dedicated apps. To "fix" this and access your content, you should stop trying to download the old installer and use the built-in tools already on your Mac. Apple Discussions Where to Find iTunes Features on Modern macOS
Guide to Downloading and Running iTunes on Modern macOS While Apple officially replaced iTunes with separate apps like Music, TV, and Podcasts starting with macOS Catalina, many users still seek older versions for legacy device support or specific interface preferences. The iTunes 10.13.99 Requirement download itunes 101399 for mac fixed
Starting with macOS Catalina in 2019, Apple discontinued iTunes as a single application and replaced it with dedicated apps. To "fix" this and access your content, you should stop trying to download the old installer and use the built-in tools already on your Mac. Apple Discussions Where to Find iTunes Features on Modern macOS
Guide to Downloading and Running iTunes on Modern macOS While Apple officially replaced iTunes with separate apps like Music, TV, and Podcasts starting with macOS Catalina, many users still seek older versions for legacy device support or specific interface preferences. The iTunes 10.13.99 Requirement