No expert but as understand it torrents are simply a way to share files peer to peer. There are sites that can list where things are found. But this tech can be misused for pirated stuff. If you are being passed from site to site then that is suspiscious and I'd run a scan on your PC if I were you. Bearing in mind that new trojans tend to not be discovered by AV until after they've been around for a while.
Seems to me that if this NX6 company provided a free trial version you'd have but the one place to visit. Anything else is at your own risk.