To update your Fenix Navdata to the latest AIRAC cycle, please use Navigraph Hub (Formally Navigraph Navdata Center) to update the Fenix A320 Navdata. If you do not have a Navigraph subscription, you will not be able to do this. Visit https://navigraph.com/ to purchase a subscription and download Navigraph Hub from the website.
Please note: You must go to the "Installed outside Simulator" tab to update the Fenix Navdata.