How to get the macOS (OS X) installer

Updated : Nov 23, 2021

November 16, 2021 Updated
Added how to get macOS 12 Monterey.

July 1, 2021 Updated
Updated how to get Mac OS X 10.6 Lion and 10.7 Mountain Lion.
(The dmg file can now be downloaded.)
November 17, 2020 Updated
Added how to get macOS 11 Big Sur.

I have summarized how to obtain the installer for each version of macOS (OS X) so far.

OS X 10.7 Lion and later can still be downloaded / purchased from Apple today (January 2020).

Also, after getting the installer, I think that you often create a USB memory for installation, but the procedure is explained in the following separate article.

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About OS support status by Mac model

Before you get the OS, make sure your Mac is compatible.

If it is not supported, an error will occur during installation, or even if it is installed, it will not start.

The correspondence status is summarized in the following article, so please refer to it.

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List of acquisition methods by OS version

You can jump to each explanation by clicking ◯ in the list below.

OS versionApp StoredmgmasOnline order
12 Monterey×××
11 Big Sur×××
10.15 Catalina×××
10.14 Mojave×××
10.13 High Sierra×××
10.12 Sierra×××
10.11 El Capitan×××
10.10 Yosemite××
10.9 Mavericks×××
10.8 Mountain Lion×
10.7 Lion×
  • App Store:Apple’s official app distribution app “Mac App Store”
  • dmg:Download the dmg file from the official Apple website
  • mas:”Mas” command that can download the application from Apple official website
  • Online order:Online order from Apple official website
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Download from “Mac App Store”

▶ You can download it from the App Store by clicking the link below.

macOS 12 Monterey

macOS 11 Big Sur

macOS 10.15 Catalina

macOS 10.14 Mojave

macOS 10.13 High Sierra

▶ As you proceed with the download, you will proceed to the OS installation screen as it is, so to finish with just the download, exit the OS installation screen from the menu.

macOS 10.15 Catalina installer

▶ Then, if you look inside the “Applications” folder in the Finder, you can see that the installer is saved.

macOS 10.15 Catalina installer

▶ Also, after getting the installer, I think that you often create a USB memory for installation, but the procedure is explained in the following separate article.

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Download the dmg file

▶ You can download it from Apple’s site by clicking the link below.

If clicking the link doesn’t work, right-click the link and try “Save Link As”.

macOS 10.12 Sierra

macOS 10.11 El Capitan

OS X 10.10 Yosemite

OS X 10.8 Mountain Lion

OS X 10.9 Lion

▶ Double-click the downloaded dmg file to create the “instalOS.pkg” file as shown below.

Then double-click it and follow the on-screen instructions to install it.

OS X 10.12 Sierra

▶ When the installation is complete, you can see that the installer is saved by looking inside the “Applications” folder in the Finder.

macOS 10.12 Sierra installer

▶ Also, after getting the installer, I think that you often create a USB memory for installation, but the procedure is explained in the following separate article.

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“Mas” command that can download installer

The “mas command” is a command for downloading an app from the “terminal” of your Mac.

It cannot be used in the standard state of Mac, it is necessary to install multiple apps, and the procedure is complicated, so please refer to another article.

【現在は使用不可】OS X 10.9 Mavericksのインストーラーを入手する方法
この記事の方法は、現時点では使用できません。理由は、以前は「masコマンド」でmacOSがダウンロード可能でしたが、既に公開が終了されたようです。なお、将来的に再度ダウンロードが可能になることに期待を...

Also, after getting the installer, I think that you often create a USB memory for installation, but the procedure is explained in the following separate article.

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Online order

The media is a USB flash memory.

アップル公式のOS X インストールUSBメモリ

You can order online from the following Apple site.

OS X 10.8 Mountain Lion

https://www.apple.com/shop/product/D6377Z/A/os-x-mountain-lion

Mac OS X 10.7 Lion

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Reference information

This is the end of the article on this page.

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