BBC.com video only recording low res

I'm using the trial version of Media Catcher to test recording the video on this page:

http://www.bbc.com/future/story/2014...re-aliens-like

Media Catcher is the only app that's been successful at all but it still only records the low definition stream. I know I receive the higher definition stream so how can I capture it?

I don't believe this is a limitation of the trial and it's the higher definition version I want so, to be honest, I don't want to purchase the product until I know it can do what I need.

Many thanks for your help - great software.