Thats your problem...
To download a torrent you need a torrent client
http://download.bitcomet.com/tracker/achive/BitCometTracker_0.2.zip
Click that and install bitcomet, then go back to the torrent and re-download it.
Prob solved.
When you go to the torrent site and click the download it will automatically open bitcomet if it doesnt and it asks you for a program to use select bitcomet
When bicomet open it will give you a popup torrent properties box, thats just telling you what your downloading, click ok then after a few seconds you should see a circle or it might be an arrow go green by the side of the torrnt that means its downloading.
Just shout if you get stuck