So, why does your "About This Mac" screen say 10.13.99?
If you are running macOS Catalina (10.15), Big Sur (11), Monterey (12), Ventura (13), or later, Apple has officially deprecated iTunes for Mac. The specific error "requires 10.13.99 or earlier" is a hardcoded limit in the iTunes installer package intended to prevent it from being installed on operating systems where its components would conflict with the new separate media apps. The Official "Fix" for Modern macOS Itunes Macos 10.13.99 Download Fix
Apple no longer pushes iTunes updates to High Sierra via the MAS. Use Terminal to fetch the final version: So, why does your "About This Mac" screen say 10
If you have landed on this page, you are likely staring at a confusing error message or searching for a version of iTunes that technically does not exist: . You are not alone. Thousands of users with older Macs (MacBooks, iMacs, and Mac Minis from 2009–2017) encounter this phantom version number when Apple’s software update system glitches, or when legacy installer packages conflict with modern certificates. The Official "Fix" for Modern macOS Apple no
So, why does your "About This Mac" screen say 10.13.99?
If you are running macOS Catalina (10.15), Big Sur (11), Monterey (12), Ventura (13), or later, Apple has officially deprecated iTunes for Mac. The specific error "requires 10.13.99 or earlier" is a hardcoded limit in the iTunes installer package intended to prevent it from being installed on operating systems where its components would conflict with the new separate media apps. The Official "Fix" for Modern macOS
Apple no longer pushes iTunes updates to High Sierra via the MAS. Use Terminal to fetch the final version:
If you have landed on this page, you are likely staring at a confusing error message or searching for a version of iTunes that technically does not exist: . You are not alone. Thousands of users with older Macs (MacBooks, iMacs, and Mac Minis from 2009–2017) encounter this phantom version number when Apple’s software update system glitches, or when legacy installer packages conflict with modern certificates.