Rename the “Launchpad copy” file to “Install macOS High Sierra” – the name must exactly match the original authentic macOS High Sierra installer.Duplicate the selected Launchpad app by selecting Launchpad then hitting Command+D (or going to the File menu and choosing “Duplicate”).

Locate a small application in the /Applications folder, like “Launchpad”.

Look for the legitimate “Install macOS High Sierra” in the directory, and if it exists, delete it by dragging to the Trash.

From the Finder of Mac OS, go to the Applications folder.If you want to install High Sierra down the road, you will need to undo this and remove the spoof installer. If you’re committed to avoiding macOS High Sierra for whatever reason, you can completely prevent the “Install macOS High Sierra” application from ever downloading via the Mac App Store with this trick, which basically spoofs a copy of the installer and locks it down so that it can’t be overwritten. How to Completely Prevent the Mac App Store from Downloading the MacOS High Sierra Installer The next tip will detail a trick to accomplish that. Or perhaps you want to be absolutely certain that the Mac App Store does not download the installer for High Sierra. Some Mac users may want to maintain automatic software downloads and updates however, but still avoid macOS High Sierra and the macOS High Sierra installer.

This alone should prevent macOS Sierra or Mac OS X El Capitan from downloading the “Install macOS High Sierra” file onto your Mac into the Applications folder, and prevent from sending the notification that it’s ready to install. Uncheck the box next to “Download newly available updates in the background”.Go to the  Apple menu and choose “System Preferences”.The first thing you can to prevent High Sierra from automatically downloading do is toggle system preferences to prevent the automatic downloading of updates in the background. How to Stop MacOS High Sierra Installer from Downloading Automatically If you do not want macOS High Sierra to be automatically downloaded onto a Mac, maybe because you’re avoiding the macOS update or postponing it while a particular bug or issue is sorted out, we’ll walk through a few steps on how to prevent a Mac from automatically downloading the MacOS High Sierra installer.

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