I wanted to post this tip here just in case anyone is still having problems with the store content staying installed.
It seems like for the most part, downloading from the Sims 3 Store to the Sims 3 Downloads folder. Isn't the issue.
Where the problem comes in is getting store content to stay installed or getting the game to recognize that it's already installed.
✽ Click images to see larger view.
The first tip I've mentioned already in the post above, but bears repeating.
⚬ If using Origin - Fully exit Origin and relaunch both Origin and Sims 3. It may take a few tries, but some report that this works.
Others have reported the couple of tips below help. -- Specially for Steam/Disc players. (this helps Origin players as well)
⚬ Delete the igs.bin and platform.bin files in the SigsCache folder
- \Documents\Electronic Arts\The Sims 3\SigsCache
Launch the game again to see if that helps. The game will regenerate these files. If not, try the tip below:
++ For this tip, please be sure to have your store content and custom content files backed up. Deleting the both files in the folder mentioned below deletes both the installed store content and custom content that is installed via the Sims 3 launcher. -- However, deleting just the missingdeps.idx file should not delete store or custom content.
⚬ Delete the missingdeps.idx file from the DCCache Folder
- \Documents\Electronic Arts\The Sims 3\DCCache
If uncomfortable deleting the files mentioned above, save a copy of your Sims 3 folder to your desktop or usb stick for back up purposes. Then try deleting the files.
This should help with any missing store content including Store towns. -- Tip for
Installing Store TownsPlease see the article linked below by Crinrict to read about the Sims 3 User Files.
Sims 3 User Files Explained
https://sims3.crinrict.com/en/2011/01/faq-user-files.html