Ensure your graphics drivers are up to date, especially if you're using DirectX 12.
Often, the main launcher in the game's root directory fails to trigger the correct process. Navigate to your game installation folder (e.g., ...\SteamLibrary\steamapps\common\Hitman 3 Hitman3.exe Right-click it and select Run as administrator 2. Bypass the Launcher and Force DX11 Hitman 3 Executable Not Found Direct3d 12 High Quality