1) use a google search like: "pirate bay matlab mac" -> much better than using searches inside torrent websites.
2) try searching for Matlab linux. Mac also uses the unix kernel.
3) bootcamp windows 7 (or VM)
4) use a lab computer. There are some in JHE with matlab installed.
-good luck. Matlab is a script based programming language that most people hate: particularly if it is "taught" by the math department. I found this site useful for math
http://web.mit.edu/18.06/www/Course-Info/Tcodes.html