The Sims Castaway Download

Hello! I recently downloaded a copy of the Sims Castaway for Wii from this site onto my laptop. It's a 7z file so I downloaded 7-Zip so I could run it. Unfortunately, every time I try to open it, something flashes onto the screen and disappears, and nothing opens. I was wondering if anybody could tell me what I'm doing wrong or how to properly open the game. Thank you so much!