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For those that are wondering: this installs these screensavers on MacOS. https://github.com/JohnCoates/Aerial

Does it download the videos themselves onto your local mac or does it stream them like the AppleTV does ?

I've tried it out and it appears to stream them, however, there's an option to cache the videos locally.

It caches them. Uses a ton of space though, so be careful.

Yep, 11GB.