If the file is missing from the main Steam directory, downloading a fresh installer from Steam Support and running it over your current installation can repair the core files.
Right-click your game in the Steam Library > Properties > Installed Files > Verify integrity of game files . steamclient64.dll
Open Command Prompt as Admin and type sfc /scannow to repair system-level file issues. 🖥️ Updating Dedicated Servers If the file is missing from the main