How to close / remove the "upgrade OSX" notification ? I keep getting an "upgrade OSX" notification (see screenshot below) with the only options being to "install" or "details" which provides more info.



I want to do neither, is there a way i can just close it, or better still prevent it coming up in the first place ?

The machine in question is currently running OSX 10.11.6 (latest patches)
Open App Store in System Preferences

Tell it not to bother you (uncheck all)