Sims 3 Store Content Constantly Uninstalling

@actionc4t  There's no guaranteed fix for this, unfortunately.  But what you can do is install everything into a clean Sims 3 folder and keep a backup copy of that folder.  So when your Store stuff uninstalls, restore the backup copy and transfer your saves to that folder.  That way, you'll only need to take a few extra minutes to fix the problem the next time it happens.

Here's how to rebuild your folder; keep a copy after reinstalling the Store stuff but before adding back anything else.

https://answers.ea.com/t5/Store-Issues/Read-First-Sims-3-Store-guide/m-p/13479922#Clean