https://thenextweb.com/insider/2019/08/04/youtube-premium-is-rolling-out-1080p-video-downloads/

There are two kinds of people in the world: those who are happy to watch videos at 480P and those who will fight for every last pixel. If you’re in the latter camp, I have some good news for you: YouTube will now allow you to download videos for offline viewing in 1080p.

Android Police first spotted the update, and the company confirmed to multiple sources that the feature is rolling out to “most Premium markets,” with more to come.