If you've lost or forgotten your serial number, don't worry! There are several solutions:
If you purchased the standalone "Home Edition" and wish to move it to Steam, you can use the Steam Key Exchange Irreversible : Exchanging your serial for a Steam key will permanently block your original serial number. Serial Number City Car Driving 1.5 Home Edition
If you cannot find the email, you must contact technical support with your full name, order ID, and payment method used to retrieve it. Activation Process If you've lost or forgotten your serial number, don't worry
To streamline updates, Forward Development introduced a direct conversion system. You can convert your legacy standalone serial number into a free Steam key: Standalone Version (Direct) Steam Version Manual download of patches Automatic background updates Installation Requires manual Hardware ID binding Cloud-bound to your account Workshop Support Manual installation of car mods One-click mod installations Steps to Convert Your Key: Activation Process To streamline updates
By entering a valid serial number, players can unlock the full potential of the game, including: