You must include a Resource.cfg file (available on sites like Mod The Sims ) for the game to recognize these files.
Install the base game first. Before adding any expansions, download the latest official patch from The Sims 3 Website to update the base game directly. the-sims-3-installment-tutorials
There are two primary ways to install CC, depending on the file format: You must include a Resource
Always back up your Electronic Arts\The Sims 3 folder (found in your Documents) before reinstalling or updating, as this contains your saves, mods, and downloads. 2. Installing Store Content There are two primary ways to install CC,
Place your .package files in the Packages folder. Use the Overrides folder if you need a specific mod to take priority over others.
For heavy store users, experts suggest keeping compressed Store files (found in the dccCache folder) under 200MB to maintain game performance.