Downloading movies on Apple TV is a simple process on mobile devices and computers, but impossible directly on the Apple TV set-top box. By utilizing your iPhone, iPad, or Mac, you can build a library of offline entertainment ready for any adventure.
If you downloaded a movie to your iPhone or iPad but want to watch it on your big screen TV (without using internet data), you have a few options:
With the release of macOS Catalina and later versions, iTunes was replaced by the Apple TV app.
Once the download is finished, you can access your videos without an internet connection: Go to the tab at the bottom (or sidebar on Mac/PC). Select the Downloaded category. Tap or click on your movie to start watching immediately. Limitations and Expirations
Apple has moved away from iTunes on Windows as well, releasing a dedicated Apple TV app for Windows 10 and 11.