This occurs because iTunes was as a standalone app starting with macOS 10.15 Catalina (released in 2019). Modern macOS versions use a different system for media management. 2. Is There an "iTunes 10.13.99"?
If you absolutely require the legacy iTunes interface on a modern Mac, the only viable (and advanced) solution is to install a virtual machine (using software like Parallels or VMware) running an older macOS (like Mojave) or Windows, and running iTunes within that environment. download itunes 101399 for mac free
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