Cannot download nor install Sims 3 Store content

irishdragon7  I would suggest installing everything while in the new Windows account, a few items at a time to make sure the content doesn't break.  Then move the folder to where you want it to be and add your saves and other user data to that.

I would also suggest keeping a backup copy of your folder with only the Store content present, so you can restore it later if your main user folder breaks.