Pet Installer does not pop up

I'm following the guide on how to install Sims 3 on Mac, I followed everything from the guide(it says to install DLCs according to the release), but when I tried to install Pets, the installer doesn't pop up. Before this, I've tried installing only Pets as an expansion, the installer did pop up. I don't know if the other expansions are affecting the Pets installer or there's something wrong that I did.