The version "macOS 10.13.99" does not officially exist. This specific number often appears in error messages when you try to install iTunes on a modern Mac (macOS Catalina or later), as those versions require you to use the Finder or Apple Music app instead of a separate iTunes download.
Summary
If you are trying to force an install and getting errors regarding "10.13.99" or version mismatching, follow these steps: itunes macos 10.13.99 download
Because you are searching for a “.99” version, you are vulnerable to fake download sites. They will offer you an “iTunesInstaller.exe” (Windows virus) or a “MacKeeper.dmg” (adware). The version "macOS 10
iTunes Library.itl file in ~/Music/iTunes/, copy that folder to your Desktop.sudo rm -rf /Applications/iTunes.app
(Only do this if you know you have a corrupted version)encountered when users attempt to install older iTunes versions on newer macOS systems. If you are looking for the final stable version of this OS, it is macOS High Sierra 10.13.6 The Mystery of macOS 10.13.99 Back up your media: If you have an existing iTunes Library
If you meant macOS 10.13.6 (High Sierra) and need iTunes:
| Your macOS Version | Status of iTunes | Required Action | | :--- | :--- | :--- | | 10.13 (High Sierra) | Active | Use App Store to update to iTunes 12.8.x. | | 10.14 (Mojave) | Active | Use App Store to update to iTunes 12.9.x. | | 10.15+ (Catalina+) | Replaced | Do not download iTunes. Use Apple Music and Finder. |