How to Disable Nagging MacOS Update Notifications ⇥ appletoolbox.com

Elizabeth Jones, AppleToolBox:

Is it just me or are those daily upgrade notifications for upgrading to macOS High Sierra annoying the bleep out of you? Every time I turn on my MacBook (2017,) it immediately starts up with that exasperating High Sierra notice to upgrade to High Sierra so I can “enjoy the latest technologies and refinements.” And it’s even popping up on my iMac (2015 with Fusion Drive,) that Apple itself recommends NOT updating to High Sierra. And I really DON’T want to upgrade to macOS High Sierra right now on any of my Macs!

Unfortunately, Apple is only supporting fixes and mitigations for Meltdown and Spectre in High Sierra, contra their original statement. MacOS updates have generally been less impactful since Yosemite,¹ there are still lots of reasons why users may be reluctant to upgrade to a major new OS version. While Apple’s developer site displays a pie chart indicating iOS version market share, I can find no such official chart for MacOS market share. As of December, though, MacOS Sierra was still more widely used than High Sierra, and El Capitan isn’t that far behind, according to StatCounter. For serious security vulnerabilities, Apple should strongly consider issuing patches for previous widely-used system versions.