While "v1.67" is a stable final retail patch for The Sims 3 , unofficial "Complete Editions" often struggle with memory management (Error 12) and long loading times because the game engine was not originally designed to run every expansion pack simultaneously on modern hardware.
This refers to the final major functional update for the disk and Steam versions of the game. While "v1
If you're trying to fix an existing installation or are looking for a way to run the game better on a modern PC, I recommend looking into community-made performance fixes like the or NRaas mods , which are widely trusted by the player base. While "v1