depends on your OS.
For Windows use www.utorrent.com.
For Mac and Linux use www.transmissionbt.com/
OR
You can get an invite to almost all torrent sites here: http://www.torrentauction.com
Yes, you can. It's illegal to do so though, except if you already own the game and intend to use the torrented version as backup, I believe. But it's certainly possible.
Torrent is a type of download. You have to download the torrent file and open it up with a special torrent download program. The torrent file, when opened, will initiate the download of the actual...