The issue may be a corrupt or leftover file somewhere in your Sims 3 user data folder. The first place I'd look is in the InstalledWorlds folder, in case the .world file didn't get deleted. You can also try removing the highest-numbered .dbc file in DCCache to see whether it helps. These files are bundled custom content (the .ebc files are store stuff), so any cc you installed through the launcher would have an entry in one of these bundles.
It's often more complicated though to try to find that file than it is to start fresh. Try installing the world into a clean folder: Move your entire Sims 3 folder out of Documents\Electronic Arts and onto your desktop, then open the launcher to spawn a clean folder, and download it into that.
If this works, you can transfer your saves and other content into the new Sims 3 folder and go on playing. The one catch is that your .dbc files need to be numbered sequentially, so the new one created when you install the world needs to be renamed to fit with the .dbc files you're moving over. For example, if your old files are dcdb0 through dcdb4.dbc, the new file in the new folder will automatically be named dcdb0 as well, and you'll need to change that to dcdb5.dbc to make sure the files are all read correctly. This assumes you have other Sims3pack-based custom content you want to keep; if not, don't bother moving the .dbc files over at all.
Here's a list of the content in your user data folder, so you know what else to move over:
https://sims3.crinrict.com/en/2011/01/faq-user-files.html
