Unable to download TED video

I'm using the latest version of Firefox, but I can not download the TED videos.

First, no download button is visible on the page despite information provided by Google that a download option is available on the left of the screen.

Secondly, I found a tip at Amara saying that the download option had been changed and was hidden under the "Share" button, but when I press the "Share" button, it would not work. There is no information on downloading, only links to Facebook, etc.

Has the download method changed again and, if so, how can I download videos?