What I did, (as I'm in the same situation) was
download it via torrent here:
http://extratorrent.com/
using Vuze (high speed torrent downloader), and PowerIso..
then I bought the keycode from Sh5 site. Works great,
and it's not pirated..

Cost me about $50. I did it
this way, as I've not been very lucky by downloading
games from sites I buy it from... often they didn't work.
I knew the torrent worked so was more willing to do it
that way, and to buy the code.