Because Apple no longer hosts iTunes prominently on its main download pages for Mac, you must look to reliable archive repositories.
This occurs due to Apple’s Gatekeeper security protocol blocking older, unsigned software.
: If you are trying to run this on a newer OS (like Catalina or Sonoma ), you must use the Retroactive tool. This open-source app modifies old iTunes versions to run on modern, 64-bit systems. YouTube·lapfix How to Install iTunes on macOS
Modern Alternatives: Managing Old Devices Without Legacy iTunes
File-sharing and tech forums often mislabel installer packages. A file named iTunes_10.1.3.99_Mac.dmg is almost always a modified, mislabeled, or corrupted package.
Since iTunes 10.13.99 is not an official Apple release (the classic versions ended at 12.x before being replaced by Music/TV, and the 10.x line was much older), these posts are framed around the "Fixed" aspect—assuming this is a community patch, a legacy restoration, or a specific niche release.
Mac OS X will block the installation if remnants of a newer iTunes version exist on your system. Open the folder. Drag the existing iTunes app to the Trash .
The transition from iTunes to the standalone Apple Music, TV, and Podcasts apps in macOS Catalina marked the end of an era. For many users, this split was a downgrade. The modern Music app frequently suffers from performance lags, a confusing interface, and a frustrating separation of media libraries.
