: For enterprise inquiries or missing keys, you can contact the developer, Heading365 GmbH office@heading365.com or through their official site at Heading365 Quick Setup Guide A320 U Activation Key - Aircraft - Forums - AEROSOFT
A unique alphanumeric activation key is sent via email or tied directly to a user account.
If you have a key, it is typically entered upon the first launch or in the "License" section of the application.