Here is a link to the offical BitTorrent downloader:
BitTorrent
Here is a link to the tracker file:
Battlefield 2 Demo: Tracker
If you havent used BitTorrebnt before please read this:
BitTorrent FAQ
Please dont misues this application, if you plan to do so, dont plan to get any support from here. Just to let you all know, my PC will be on allnight to seed the demo, if you can do the same it will help the others download faster. All you need to do it to keep the application open and set the upload to the higest setting. Hope to see you all in the battlefield