I don’t own the FSLabs A321 for MSFS, but the hub lists it and has an UPDATE prompt in the MSFS 2020/2024 installed outside simulator tab. This started to appear when the FSLabs A321 for MSFS was released. Why do I get a prompt to update the navdata for an MSFS addon I don’t have installed?
I do have the FSLabs Airbuses installed in P3Dv4, but that navdata is handled by your FMS Data Manager and is up to date.