I think they've very recently started adding more support for Mac through Origin, because until now, patching/using The Launcher on a Mac was bugged out to all hell. This honestly may still be true. I'm glad you were able to manually patch, though - so it seems like you resolved this on your own.
My fiancee is a Mac user, but we don't use it for gaming, as they're unfortunately really not designed to handle games. Honestly, if you continue to use a Mac for Sims, your best bet is to actually install Bootcamp, and install the game on the Window's partition.