I just want to play the Sims 3 with expansion packs I bought

@coolgirl1441  If you're trying to install Sims 3 Store worlds (anything listed here), keep in mind that those need to be installed through the Store site, not the EA App.  More information is in the first post of this master thread:

https://answers.ea.com/t5/Store-Issues/Sims-3-Store-world-can-t-register-install/m-p/12619800

For anything else, please list the content you want to install, and post the error message you get, if any, when you try.