MvQmXYxyA I've split your post into its own thread because your issue is different than that covered in the other thread. Please uninstall the EA App with Revo Uninstaller (the free version is fine), and restart your computer before reinstalling the App. Run the installer as an admin: right-click the download and select "Run as administrator."
If you use a third-party antivirus, disable it, temporarily, when reinstalling the App, and test Sims 4 once before reenabling the antivirus. (As long as you don't do anything else at the same time, your computer should be safe.) When you do so, set an exception for EADesktop.exe. Also set exceptions for TS4_x64, TS4_DX9_x64, and TS4_Launcher_x64; or the entire Bin folder they're in.