Just a note, Criterion is using a front end for content hosted on Vimeo. There are some other sites that use it, such as The Gizmoplex (MST3K), Arrow Films, and Troma Films, to name a few. It was a while back that I remember using StreamFab on Criterion... it was able to download, but only up to 720p.
AllNight
do the movies play ok in your regular browser ??
try copying the URL from your regular browser and paste it into streamfabs browser and see if the movie
will download.