July 2021
@will0wxo I've split your post into its own thread in the Sims 3 Mac section, since the other thread was old and about the Windows version of the game. The 64-bit Mac version doesn't have an Expansions & Packs tab.
It looks from your screenshot like you have Late Night and High-End Loft Stuff installed already. Are they not loading in-game? The easiest way to tell is at the Main Menu: if you can choose to start a new save in Bridgeport, then LN is loading properly.