Re: Help! My entire game of Sims 4 is gone after update
localthumbcache.package is a cache file that can get big fast. It gets recreated after it's been deleted. It's a good idea to delete this file when having issues with the game and/or adding/removing custom content or mods.
It may not bring back your game, but it helps with troubleshooting the issue.
If you want to learn more about Sims 4 user files, see the link below:
Sims 4 User files explained
https://sims4.crinrict.com/en/2014/09/user-files-explained/
