Maybe this wilh help someone, but here is what has been working for me. I am assuming you have installed Ex Pat Shield and have the icon on your desktop. I am running Windows XP and my browser is Internet Explorer.
I start with a clean desktop. No apps open, Internet connection on. I do not even have IE open.
Click on Ex Pat Shield Launcher icon on desktop. It automatically opens with Internet Explorer. At the top of this web page, where you normally type in a website url, I put the bbc link (I believe it will currently have the expat app url, but you can replace that with the bbc one). I only had to type the whole bbc link once… the next time, IE listed it underneath for me to select. Now, you should be at the bbc website, and good to go with some navigation to equestrian events and then to the live player.