A valid is included only with paid purchases. Keys are typically 16–20 alphanumeric characters (like XXXXX-XXXXX-XXXXX ), not a short number like “1138”. That number has no official connection to the game — it may be a fabricated string from a crack group or a typo.
Run the installer executable (e.g., setup.exe ). Follow the on-screen prompts to choose your installation directory.
To install and activate (version 1.138), you generally need a serial key provided at the time of purchase from a retailer like Steam or GOG. How to Find Your Serial Key