Download sims 3 ambitions, pleeeeeaaseeeee help!!?

i downloaded sims 3 ambitions from thepiratebay.org and with final torrent. i have no idea as to what to do from there on. i have windows 7 and i can't find a way to mount magic iso. every time i click on it i get two options that say "add to image file" and "add to downloaded game" if i click one of these it says to start up magic iso.. i don't know how. so pleasee help. i need simple step by step directions. THANKYOU! :)