Apple提供官方方式獲取完整的macOS安裝程序，包括通過Mac App Store下載最新版本或訪問Apple支持頁面查找舊版本。 1. 在Mac App Store搜索所需macOS版本並下載；2. 通過Apple支持文章獲取舊版本的直接鏈接；3. 使用Terminal命令將安裝程序?qū)懭險(xiǎn)盤以創(chuàng)建可啟動(dòng)安裝器；4. 安裝過程中安裝程序會(huì)自動(dòng)刪除，建議提前複製安裝器或製作U盤備份；5. 若已丟失安裝程序，可重新從App Store或支持頁面下載。

Apple doesn't make it super obvious where to get a full macOS installer, but there are official and reliable ways to do it — you just need to know where to look.

Check the Mac App Store (and how to find older versions)

The Mac App Store is the main place to download the latest macOS version. Just search for the name of the macOS release you want (like macOS Sonoma or Ventura), and hit "Get." But here's something important:

• The App Store only shows the latest version prominently. Older installers aren't easy to find.
• You can still access older versions by going directly to Apple's support pages that link to them.

For example, if you need an older version like macOS Monterey or Big Sur, Apple publishes direct links in support articles. Just search something like “How to download macOS Monterey” on Google, and the official Apple article will show up with a link to the Mac App Store page for that specific version.

Use Terminal to create a bootable installer

Once you've downloaded the macOS installer from the App Store, it usually auto-launches after downloading — which starts the upgrade process. If you want to keep the full installer file , don't run it right away. Instead:

• Look in your Applications folder — the installer should be there as "Install macOS [Version].app".
• From there, you can use Terminal to create a bootable USB drive. For example, to make a bootable installer on a USB drive named “MyUSB”, you'd use a command like:

 sudo /Applications/Install\ macOS\ [Version].app/Contents/Resources/createinstallmedia --volume /Volumes/MyUSB

This method gives you a full installer you can use anytime — even offline — and it works great if you're setting up multiple machines or troubleshooting.

Why the installer disappears after update

A common issue people run into: after installing macOS, the installer deletes itself automatically. That's by design. So if you didn't save it somewhere else before running the update, it's gone.

To avoid this:

• Don't run the installer immediately after download.
• Make a copy of the installer app before starting the installation.
• Or create a bootable USB right away — that way you always have a backup.

If you've already updated and lost the installer, just re-download it from the Mac App Store or Apple's support site. It might feel inconvenient, but it's straightforward once you know where to go.

基本上就這些。

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