nanazzng Please try installing the worlds into a clean user folder, one at a time. Move or rename the Sims 3 folder in Documents > Electronic Arts, open the launcher to create a new one, download one world, install it, and see whether it appears in-game. If it does, try one more world, then another, until you have them all installed.
If this stops working at some point, let me know which world broke it AND the order in which you installed the worlds. Please also let me know whether you own any other Store content.
If you get all the worlds installed properly, you can move your saves and other user data to the new Sims 3 folder from the old one. Here's a more detailed walkthrough:
