Guide on just downloading 3 files:
Step 1:
Download Azureus:
(NOTE: This guide is for Azureus, although using your brain it will be the similar settings in almost every torrent client)
Register to unlock hidden link
Once downloaded open the torrent file in azureus and right click on it and then left click on "Show details.
Step 2:
Click files and have a look whats there
Step 3:
Right click on the file you want to download then go down to "Set priority" and select if you want to download it or not.
You can use CTRL+Click to highlight multiple files and save time.
------
Hope that helps
