"The specific file could not be found"

GaiaT04  This error is typically related to an overly-active antivirus.  So please set an exception in your antivirus for EADesktop.exe.  Set exceptions for TS4_x64, TS4_DX9_x64, and TS4_Launcher_x64 as well; or the entire Bin folder they're in.  You may need to repair the game afterwards.

If this doesn't help, please disable your antivirus (temporarily) and repair Sims 4 again, then see whether you can play.  As long as you don't do anything else at the same time, your computer should be safe, and you'll know for sure whether this is the issue.