Youtube clip only partially downloads

The 1080p version of this youbube clip (>100MB) only downloads the first 8 MB. This is repeatable over the past 2 days:

https://www.youtube.com/watch?v=URtP4Q4cHAo&feature=youtu.be&a.

Other youtube videos download without issue. Using 4K Video Downloader v3.6.1 on OS X.