You can purchase a standalone serial number directly from the official City Car Driving website. Conclusion
Pirated or improperly activated versions of the game often break the ability to install mods. Since the City Car Driving community thrives on custom cars and maps, losing this feature significantly degrades the experience.
Some "key generator" software is actually a front for phishing, aiming to capture your login credentials or financial information.
If you want to enjoy the most stable version of City Car Driving 1.5.9 with full mod support and no security risks, the best methods are: