已下载macOS High Sierra安装包后如何阻止安装？安装包找不到怎么办？

Hey there, I’ve dealt with this exact frustrating scenario plenty of times—you download the High Sierra installer but can’t find it, yet the system nags you to install every time you reboot. Let’s get this sorted:

Step 1: Locate the Hidden Installer #

macOS often tucks pending update installers away in a hidden system directory instead of your Applications folder. Here’s how to find it:

• Open Finder, click the Go menu at the top.
• Hold down the Option key—this will reveal the hidden Library option in the menu. Click it.
• Navigate to Library/Updates. You’ll see folders named with numeric codes (like 031-12345); one of these contains the Install macOS High Sierra.app file.
• Once you find the installer folder, you can delete it entirely to remove the source of the pop-ups.

Step 2: Use Terminal to Block Prompts (If Deleting Doesn’t Work) #

If the pop-ups still persist after deleting the installer, use Terminal to disable the automatic update triggers:

1. Open Terminal (found in Applications/Utilities).
2. Run this command to turn off automatic update checks:

   defaults write /Library/Preferences/com.apple.SoftwareUpdate AutomaticCheckEnabled -bool FALSE
   

3. If the installer is still lingering somewhere, run this command to force-remove it (you’ll need your admin password—Terminal won’t show characters as you type):

   sudo rm -rf /Library/Updates/Install\ macOS\ High\ Sierra.app
   

Step 3: Quick System Preferences Fix (For Full Update Block) #

If you don’t want any update prompts at all for now, head to System Preferences > App Store and uncheck:

• "Automatically check for updates"
• "Download newly available updates in the background"

This will stop all update-related pop-ups, not just High Sierra.

Pro Tip: Double-Check Downloads #

Don’t forget to do a full Finder search for "High Sierra"—set the search scope to "This Mac" (click the dropdown next to the search bar) to make sure you didn’t miss the installer in a subfolder of your Downloads or elsewhere.

内容的提问来源于stack exchange，提问作者Mentalist