This occurs due to Apple’s Gatekeeper security protocol blocking older, unsigned software.
You can use official iTunes, but might need to download the specifically designed 12.8 DMG file from Apple Support. Summary of Solutions Sync iPhone/iPad Use Finder in macOS Catalina and later. Listen to Music/Buy Use the Music App . Manage Legacy iPod Use Uptodown to download iTunes 12.8.x. Fix 10.13.99 Error Upgrade to a modern workflow; uninstall the old DMG. If you'd like, I can: Help you find a specific, older version of iTunes. Explain how to sync your old device in the new Music app. Recommend a better third-party tool for managing music. Let me know which of these you'd like to try next! Can't install iTunes - Apple Support Community download itunes 101399 for mac fixed
Searching for "iTunes 101399" does not yield a legitimate Apple software version. The official numbering for iTunes capped at version 12.x before being replaced by separate apps. This occurs due to Apple’s Gatekeeper security protocol
If you upgraded your Mac to macOS Catalina or later and discovered iTunes is gone, . Apple has officially discontinued iTunes for these operating systems. Instead: Listen to Music/Buy Use the Music App
Error 101399 when attempting to download or install iTunes 12.6.5 (build 101399) is almost always due to or a corrupted download cache . The fix requires:
For Windows users who may have found this article, the situation is different. iTunes remains available for Windows PCs. You can download it from Apple’s iTunes website, and the current version is 12.13.1.3. However, Apple has also released preview versions of Apple Music, Apple TV, and Apple Devices for Windows as potential alternatives.