If you need a valid license, you can purchase one from the official developer’s website (Forward Development) or authorized stores like Steam. They often have legitimate sales.
City Car Driving Home Edition 1.5 was released around 2017–2018. Since then, updates like 1.5.2, 1.5.4, 1.5.6, and 1.6.0 (2023) have added: serial number for city car driving home edition 1.5
I strongly recommend Choice 1.
Don’t panic. You can recover your serial number if you originally purchased a legitimate copy. If you need a valid license, you can