Been getting this pop up everytime I start the Go4 app. Had a quick google and it looks like it’s to do with NFZs.
What is this update?
I have NFZs unlocked through parameter settings. Would it affect me if updated?
Any way to make it stop popping up without updating?
It’s an update to the NFZ database - so updating it shouldn’t change the parameters.
You can check, after the update, if the NFZ parameters have been changed and change them back to the way you have them. Bingo! 
Another time, you can only prevent this reappearing by keeping your device off-line and not updating the Go4 app.
Edit: I have the same issue as a result of changing device whilst my drone-phone is being repaired.