on the official site for detailed troubleshooting steps regarding license freezes or "license not activated" errors. Review the 1.5.9 Update Patch Notes
When you purchase the game legally, your unique serial number is sent via a purchase confirmation email . This number is tied to your specific hardware ID to prevent unauthorized distribution. city+car+driving+serial+number+159+work
Next time you see a silver sedan with a small barcode on the windshield, remember: that serial number is working hard, so the city keeps moving. on the official site for detailed troubleshooting steps
Using keys found online often leads to the "Invalid Serial Number" error because the key is already in use or blacklisted by the developers. city+car+driving+serial+number+159+work
