Re: [SOLVED] 64-bit Sims 3 content not in Origin library
@3f1cfeeedf0ade54 If you bought the expansions directly from EA, there's no need to register them. The old Sims 3 site shares information with Origin and the EA App, so packs owned in one location should also show as owned in the other.
To install Sims 3, sign into the EA App (Windows) or Origin (Mac), open your game library, select Sims 3, and download your content. If you haven't installed the base game, do that first, and you should see the option to install your packs as well. If you've already installed the base game, click Manage > Manage Add-ons (EA App) or More > Expansion Packs (Origin), and you should see a Download button for each of your new packs.
If this doesn't help, let me know whether your computer runs Windows or macOS and where you bought the expansions.