Apple has abandoned the High Sierra user. But your music, your iPod, and your legacy iOS devices have not been abandoned. By following this guide, you can keep iTunes running on your “10.13.99” machine for another five years.

| Error Message | Solution | |---------------|----------| | “iTunes requires macOS 10.13.6 or later” | Your OS is too old (e.g., 10.12 Sierra). You cannot install this version. Download iTunes 12.8.2 for Sierra instead. | | “A newer version of iTunes is already installed.” | You have a beta or corrupted version. Use AppCleaner to remove iTunes manually, then reboot and reinstall. | | “The installer encountered an error (code 2).” | Your System Integrity Protection (SIP) is blocking part of the install. Boot into Recovery Mode, disable SIP temporarily, install, then re-enable SIP. | | DMG won’t mount | Corrupt download. Delete the file, clear your browser cache, and re-download from Apple. |

Let us assume you have a pristine copy of macOS 10.13.99 (or rather, 10.13.6) and need to install iTunes from scratch.

Uninstall your existing broken or old iTunes.

: Open the High Sierra link in Safari to trigger the App Store download, which installs the complete 5.23GB operating system.