Re: Sims 3 Store Downloads won't Install
@karategal49314 Just as an experiment, please try downloading into a clean user folder. Move your entire Sims 3 folder out of Documents > Electronic Arts and onto your desktop, open the launcher to spawn a clean folder, download one item, and click Install. The splash screen can be behind the launcher, so you may not see it, but if the install process is working, you'll get a second plumbob in your dock. You can click on that to see the installer working.
And if you don't get a second plumbob, close the launcher and reopen it, then try to install again.