I managed to download and install SleepisDeath but I can't open the game because I haven't got Rosetta. Every time I try it comes up with this message: "To open SleepIsDeath, you need to install Rosetta. To install Rosetta, connect to the Internet and open SleepIsDeath. If you cannot connect to the Internet, insert your Mac OS X installation disc, open the Optional Installs folder, and double-click Optional Installs." Trouble is, I am connected to the Internet and every other program seems perfectly capable of recognising this, and because I bought my Macbook complete with SnowLeopard already installed, no installation disc was included. I'm out of ideas and I really want to play the game so any help would be really appreciated. Thanks.