This is the first time I've been in position of owning (well, being the family support call for) a Mac that is now no longer officially supported by the newest OS, and as such I've not seen this before. If this is normal then that's fine, if a bit annoying. I got a call from my mum yesterday who's got an App Store notification that there's an update available. When she clicks it the only thing that it's saying is available as an update is macOS Sierra. Now, she's running an early 2009 Mac mini which according to everything I've read cannot run Sierra. Is she going be constantly told to upgrade to an OS that her Mac can't even run or will these notifications stop at some point?