Apple TV on a MacBook Air
Can you have Apple TV on a MacBook Air and how to set it up
MacBook Air 11″, macOS 10.13
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The Apple TV App is available on Macs running macOS 10.15 Catalina.
If your Mac supports it, see here to update it: How to upgrade to macOS Catalina - Apple Support
Otherwise, you can access the Apple TV+ subscription content from the https://tv.apple.com website.
You can access movies and Tv shows from other producers and studios normally through iTunes.