Because the 32-bit and 64-bit versions are distinct, you must install version 1.70 from scratch. It will not update an existing 32-bit installation.
The Sims 3 Patch 1.70 is an essential update released specifically for to maintain compatibility with modern Apple operating systems. While Windows users typically remain on version 1.67 or 1.69, version 1.70 was introduced to transition the game from a 32-bit to a 64-bit application , enabling it to run on macOS Catalina and later. Key Features and Fixes in Patch 1.70 The Sims 3 Patch 1.70 Download
This patch is unique because it is not just a standard update but a complete architectural overhaul for the Mac platform. Because the 32-bit and 64-bit versions are distinct,
Resolves an issue where the game could get "stuck forever in Finalizing" during the installation process. Bug Fixes: While Windows users typically remain on version 1
Corrects the bug where the application icon would appear hidden or invisible in the dock.
If you own the standard 32-bit version of The Sims 3 on Mac, the "64-bit & Metal" version should appear as a separate title in your EA App library .