Make sure you have .NET Framework 4.8 installed. Download it from the link above and restart your computer after installation.

Ensure 7-Zip is properly installed. Check your internet connection and firewall settings. Try running the ToolKit as administrator.

Verify that the DLCs were extracted to the correct game directory. Make sure The Sims 4 is completely closed during installation. AND Remember to check if you installed "EA DLC Unlocker"!... Restart the game after installation.

Enable mods and script mods in your game settings. Check that .ts4script files are in the main Mods folder, not subfolders. Use the Mod Manager to verify file locations.

The FPS Booster creates a backup of your original settings. You can restore them from the backup folder. Try different preset options to find what works best for your system.

Close and restart the ToolKit after changing the language. Make sure you're using the latest version. If the issue persists, delete the Profile.ini file and restart the application.