Re: The Sims 4 won't run due to missing or damaged data

@RoseEcho25345  That means something in your old folder was causing the issue.  It could be something in Mods or ConfigOverride, so check those first.  Saves and Tray files (saved households and builds) are probably fine, as are Screenshots and Recorded Videos.  The first round of login rewards is saved to accountDataDB.package now.  The rest can be discarded, but here's a description of the files in case you want to know what they are:

https://sims4.crinrict.com/eng/2014/09/user-files-explained/