MarsBar24 If you mean your expansion and stuff packs, do they not show up in the EA App, under Sims 3 > Manage > Manage add-ons? That's where you'd find the EPs and SPs. Standalone worlds need to be installed through store.thesims3.com.
If you did install your EPs and SPs, they might be disabled. Open the launcher's Expansions & Stuff Packs tab and check the boxes next to the packs. (No need to click Install; anything listed here is already installed and just needs to be activated.) If they're already checked, uncheck and re-check them. If they don't appear at all, but you DID install them through the EA App, please list the packs you're missing.
Let me know if you need help moving your saves.
billblogs Expansions and stuff packs can't be installed through the Sims 3 website. I don't think that was ever possible, but if it was, that method stopped working many years ago.