You install it the same as other custom content. You double click the sims3pack that you have downloaded and it should automatically go into the launcher for you to install.
When you create your own world in CaW - once finished, you open CaW and click on "select world to export". If all goes well, a sims3pack will go into your "exports" folder which you then cut and paste into your "downloads" folder and then install it from the launcher.
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When you create your own world in CaW - once finished, you open CaW and click on "select world to export". If all goes well, a sims3pack will go into your "exports" folder which you then cut and paste into your "downloads" folder and then install it from the launcher.
Hope this helps.