Steam users typically manage DLC through the Steam client, though the EA app still runs in the background.
Installing varies slightly depending on your platform and launcher. The base game must be installed first (it is currently free on all platforms) before you can add expansion packs. PC & Mac (EA App) the-sims-4-island-living-installation-tutorial
The EA app is the primary launcher for Windows and newer macOS versions. and log in. Go to your Library and click on The Sims 4 tile. Select Manage and then Manage Add-ons . Find Island Living in the list. Steam users typically manage DLC through the Steam