After installing the version, do this:
The game's graphics and sound design have been improved in the repack, providing a more immersive gaming experience. The game's visuals are vibrant and detailed, with well-designed environments and character models.
The "Complete Edition" repack by RG Mechanics is a popular choice for The Sims 3 because it compresses a massive game into a manageable size while including all expansions, stuff packs, and store content.