Note: The specific version number "10.1.3.99" does not correspond to a standard public release from Apple’s official versioning system (which typically follows patterns like 12.8.2, 10.7, etc.). However, this article is written to provide authoritative, safe guidance for users looking for older, specific, or legacy iTunes builds for macOS, assuming "101399" refers to an internal or specific installer build near the iTunes 10.1–10.2 era (~2011).
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