There can be several reasons behind it.
Rarely, invitations will be just thrown there for a limited time, but what we did is we got in touch with someone that implied having an account in one of their threads.
In case you don't know how to download files from the torrent network, you need a BitTorrent client software for that.
If you are, make sure to use a VPN to protect yourself online.
Like any good protagonist he has problems with authority, follows his gut and bends a few rules while achieving the best solved case rate in all of California.
The rest is up to how persuasive you are.
We have listed top sites that offer quite a good collection of videos and learn how to download files with uTorrent like software.
You will find torrent listings with the same keyword on the page.