Re: Sims 4 not launching

@o_vanboxtel  Yes, you can restore your progress by moving the contents of the saves and Tray folders from the old Sims 4 folder to the new one.  It's best to move the files themselves, not the folders they're in.

Before you do that though, please test any mods or custom content you were using previously.  Some of your mods and cc may have broken with the latest patch, in which case you'll need to update or do without.  If you have a lot of content, the 50/50 method can make the process much more efficient:

https://modthesims.info/wiki.php?title=Game_Help:Finding_Problem_Custom_Content#The_50.25_Method

Please keep in mind that a number of mods may be broken, so you'll need to test everything at least once.  It might save you some time to just download updated versions of whatever you can find.

Other than mods, saves, and Tray items, most of the content in the Sims 4 folder is generic and will regenerate as necessary.  You might want to keep the contents of Screenshots and Recorded Videos; you can discard the rest.