: On macOS 10.13, iTunes is already part of the operating system. You do not need to download it as a standalone app from the web.

Since "macOS 10.13.99" isn't an official version (the final version of High Sierra was ), I'm assuming you're looking for the last compatible version of iTunes for that operating system.

Determined to find a solution, John embarked on a quest to find a way to download iTunes for macOS 10.13.99 (which, surprisingly, existed). He navigated through the depths of Apple's support website, scouring for any mention of an older iTunes version compatible with his OS.

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Even when downloading the correct iTunes 12.8.3 for macOS 10.13.6, you might encounter issues. Here is the troubleshooting guide: