@kimhunt1973 There's no hard limit to the number of worlds you can install, although eventually there might be too much data for the game to handle. You wouldn't be able to travel to the worlds without a mod, specifically NRaas Traveler, although you should be able to start a new save there. The fact that you can't suggests the content broke in some way, perhaps because you installed too much of it at once or the launcher bundled it into excessively large files.
I would suggest trying to install one world in a clean user folder, like this:
https://answers.ea.com/t5/Store-Issues/Read-First-Sims-3-Store-guide/m-p/13479922#Clean
If it works, as in, you can start a new save in that world, you can install the other worlds, one at a time, and test them too. Then you can transfer your other content to that new folder and pick up where you left off. I would suggest reinstalling all your Store content, leaving behind the old files, so you don't wind up with duplicate items from the original installs of these worlds.
