As far as I can see, the BCF Weatherzone Tracker desktop client has been discontinued. Although I found no public mention of it, the application's official download page no longer exists. I tried installing the client on my PC and it says that it cannot connect to the central server, which I would usually catalog as a temporary malfunction, but since it's been going on for several days now, it's probably more than that.
Until the situation gets resolved (if ever), you can try using an alternative solution such as The Desktop Weather or WeatherBug.