I downloaded a few episodes of a cartoon in 1080p today. 6.1.9.5.
Either this is movie/show specific, or region-specific. However, when MAX worked in the past versions (it's not now, only getting errors), it could never download everything in 1080p.
For example, a 15 season TV series (E.R.?) downloaded most of episodes in a specific season in 1080p, then in another, the opposite, 720p for 90%
Same for "FRIENDS".
And depending on the location (Brazil?) it was limited to 720p, with a warning this was due to the cryptography imposed by the server (?).
Some users reported 4K downloads to be possible, but this is rare and if I am not mistaken, from content uploaded to the MAX website prior to a change that broke these?