Torrent I'm guessing. Download uTorrent program, then after that go to KAT.PH or Piratebay.SE and go to HD movies or search for the movie you want, click on download torrent, open up the small torrent file you download and it'll download in the uTorrent program automatically.
There is no way in hell that Casino is his best flick. None.
I absolutely loved Casino. It is 3 hours long, but feels like an hour and a half to me. It is entertaining from start to finish with amazing acting and filming. Even in transitions between scenes, narration kicks in with perfect timing so the flow is constant.
I don't think it will bother you at all in the movie. One, it's a long movie, so they have more time to curse. Second and more importantly, it feels true to the characters. The movie even comments on it, the main character was surprised at how much Wall Streeters curse. The characters in the movie are pretty vile. The characters in movie are not legit brokers, but scammers and con men who basically lied all day long and ripped people off. Scorsese said it's a movie about contempt.