@belleshirley Just to clarify, when you open your game library, then click Sims 3, then Manage > Manage add-ons, do your packs show as installed? If not, please post a screenshot of what you do see there.
And if the packs are installed, or you can install them now, do they show up in the launcher's Expansions & Stuff tab or not? If they're there, you'd simply need to check the boxes next to them in order to get them to load in-game, or uncheck and re-check the boxes if they're already checked.
The reason I keep asking is because there are a few different issues that have similar descriptions but different associated details, and they also have different causes.