As of recently, the download button has been replaced with the Watch Later button. After some exploration, I found the download button under the popup menu for queued videos, but it won't download and there's a show error button that says "FetchFileUrlInfo Stop". It does this for every video I've tried. I haven't tried deleting and reinstalling, but I'm hesitant, since I have over a gigabyte of downloads. I love this app when it works, but not when it has these bugs.
Customer support service by UserEcho