Re: Do what I've done
I've no idea what device you have, but you don't have an iPhone running a recent version (but not latest) if it isn't nagging you. Perhaps you update more than you think, but quite a large portion of the Internet is now filled with people asking how to get rid of update reminders on IOS 9. I have followed several of the methods such as removing the downloaded update file, but within a couple of weeks the phone gets a new copy without my permission and starts nagging again. This is on the iPad Air, 5S and 6S and has been the case for several versions now.