Downloading The Sims 3 and all expansion packs for free on Mac involves navigating between official free content provided by Electronic Arts (EA) and unofficial community-hosted "repacks." Official Free Content and Downloads
If you are using an older Mac (pre-2019) running an older OS like Mojave, the original 32-bit version will still work. However, avoid "all-in-one" free downloads; these are notorious for corrupting "The Sims 3" folder in your Documents, leading to the "Service Initialization Failed" error. sims 3 all expansion packs free download mac link