![]() ![]() There’s no real harm in deselecting that checkbox - you’ll just have to wait for updates to download when you decide to install. Apple explains it in a support document - it’s tied to the “Download newly available updates in the background” checkbox in System Preferences > App Store. This automatic upgrade behavior may be annoying, but it was possible with Sierra as well, although no one I’ve talked to remembers Apple pushing Sierra in the same way. Regardless of your opinion of High Sierra, installing it will take quite some time - an hour or more - and you should make sure you have a backup before starting, as per Joe Kissell’s advice in “ Take Control of Upgrading to High Sierra.” You almost certainly don’t want to click Install when that notification appears. That’s confusing - Apple should instead present a Cancel button. If you don’t want to install, the only way to cancel is to click Details, which launches the App Store app and displays the High Sierra description, and then quit App Store. ![]() What happens is that Apple’s Software Update automatically downloads High Sierra in the background and then presents the notification shown at the top of this article to the user, offering just two choices: Install and Details. (At least they weren’t scrambling to deal with a bunch of users inappropriately installing High Sierra!) Additional details became available while talking to Jason Dettbarn, CEO of device management firm Addigy, since Addigy’s consultant and MSP customers who had used Addigy to block unauthorized macOS upgrades were scrambling to explain what was going on Happily, because I was flying to MacTech, within minutes of arriving at the hotel, I’d run into Watchman Monitoring’s Allen Hancock, who confirmed my suspicion that Apple was pushing out High Sierra updates. That was too many simultaneous instances to be anything but an automatic push from Apple. I saw that message while on a plane to MacTech Conference, and once I had landed in Los Angeles, I received additional messages from Watchman telling me that my father’s and uncle’s Macs had also downloaded High Sierra. I was surprised, since she’s quite capable on her Mac but never undertakes major upgrades without asking me first. The first hint was an email from Watchman Monitoring telling me that my aunt’s Mac had started downloading the High Sierra installer. I have Watchman keeping an eye on all of our Macs, my parents’ Macs, and my aunt and uncle’s Macs - in other words, the Macs that I’ll have to fix if something goes wrong. Watchman Monitoring sits in the background, looking for events of interest on a Mac and notifying the consultant, MSP, or IT admin who’s responsible for keeping that Mac running. I realized this was happening because I’m testing Watchman Monitoring, an app and service used by Apple consultants, managed service providers (MSP), and large Mac-using organizations. ![]() In short, if you get a macOS notification asking you to install High Sierra, click the Details button to launch the App Store app, and then quit it. If you’re running macOS 10.12 Sierra or earlier, and do not want to upgrade to 10.13 High Sierra right now, be careful because Apple has started pushing High Sierra to older Macs and making it easy to upgrade inadvertently. #1641: LastPass breached, Live Text aids recipe input, fix for failed MobileDeviceUpdater installsĪpple Starts Pushing High Sierra on Unsuspecting Mac Users.#1642: How to identify phishing attacks, new iPhone and iPad passcode requirements.#1643: New Mac mini and MacBook Pro models, new second-gen HomePod, security-focused OS updates, industry layoffs.#1644: Explaining Mastodon and the Fediverse, HomePod Software 16.3 and tvOS 16.3, GoTo breach.#1645: AirPlay iPhone to Mac for remote video, Siri learns to restart iPhones, Apple's Q1 2023 financials. ![]()
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