The Kenwood KPG-D6 software is relatively well-protected and cannot be activated simply with a serial number (unlike the classic Kenwood KPG software). The only reliable way to ensure you always have a working, up-to-date version of KPG-D6 is to purchase a license.
However, obtaining a license can be challenging, as most Kenwood dealers are not user-friendly and often refuse to work with private individuals.

We recommend visiting the NX5000 fan club website at https://nx500.com, where you can find more information on this topic, including a list of dealers who are willing to handle small orders, work with individuals, and support radio amateurs: https://nx5000.com/dealers