How do you install expansion packs?

I don't know how to do it. I tried doing it the other day and all it did was update my game. Do I download the packs I want then install them the same way I installed the base game oh and they said I can't update the game until I add the expansion packs first.. so I gotta do it again.

Hello,

Do step 2 first and then go back and start with step 1 again: https://games4theworld.forumotion.com/t1171-must-read-how-to-install-the-sims-3-correctly

After doing so - you can install expansions by opening the .rar file you downloaded using ONLY WinRAR - www.games4theworld.org - and then reading the included "# Installation Guide.txt".