Unversity life installing problems

im having problems with installing the expansion. i have tried to follow the installation guide but got lost because i don't have university life installed. i downloaded it from this site. when i go to open the .rar file the only thing that i see is a .exe file which i know cant be installed on mac. is there something that I'm missing or that i need to download to get it to work?

Download stuffit expander 13 from the pirate bay. Then drag and drop the rar file of the sims into stuffit expander, once you have installed it. Once that has opened the file into a folder (I usually just have it all go onto my desktop and clean it up later) you will need to go to application>utilities>disk utilities. When that is open click on file>new>disk image from>and click on the folder from your desktop from the window that will open. Click on yes for everything that it asks you or save or whatever. Eventually (some of this takes a long time) it will create a .dmg on your desktop. Double click on that and follow the directions inside.