Welcome to 4 years ago. If your serious see below, if not disregard my pickup on sarcasm:
Basically you have the torrent program (azureus, bittorrent, others)
Go to a torrent website (torrentspy, mininova, demonoid, others)
Search for file and click link
Link opens a file download in your torrent program.
Save to hard drive.
Same concept as a p2p program but using host servers to provide the link, then people can “seed” the file so just like p2p just slightly different.