The Sims 3 Patch 1.70 Download ((top)) Page

Makes The Sims 3 compatible with macOS Catalina and later, which no longer support 32-bit applications.

Corrects the bug where the application icon would appear hidden or invisible in the dock. The Sims 3 Patch 1.70 Download

: Fixed launcher icons for Expansion and Stuff Packs so they light up correctly when installed. How to Download Makes The Sims 3 compatible with macOS Catalina

Here is a summary of the changes included in Patch 1.70: which dropped support for 32-bit applications.

: This patch was released to make the game compatible with macOS Catalina and later, which dropped support for 32-bit applications.