Instructions: How to download a complete macOS installer

If you want to install Mac OS X or macOS on an Apple Mac, you need the corresponding installation file - the so-called "Installer". Where you can download (older) Mac operating systems, I've already given you that in this guide shown. Instead of the full installer with several GB in size, however, sometimes only a few MB file is downloaded, which loads the rest from the Internet when it is executed. That's stupid if you want to work on a Mac without an Internet connection or on several devices - you will find the solution here.

Download a full macOS installer - several GB for a full Sierra, High Sierra, Mojave or Catalina. You can get step-by-step instructions here.
Download a full macOS installer - several GB for a full Sierra, High Sierra, Mojave or Catalina. You can get step-by-step instructions here.

Example macOS High Sierra Installer - 5,18 GB instead of 19,9 MB

For example, if you want to download the 2017 operating system macOS 10.13 High Sierra as a complete installation file, then you should see from the size whether that worked. Because then the file is about 5 gigabytes in size. If you only got the installation help from the App Store, it only measures around 19 or 20 megabytes. 

In order to carry out an installation on several Mac computers or on a Mac, iMac or MacBook without an Internet connection, you need the entire macOS High Sierra Installer. And you can get it via the third-party app "macOS High Sierra Patcher Tool for Unsupported Macs" (Link) from DosDude1. I have already described its software to you here: Install macOS Mojave on old, unsupported Macs.

Step-by-step instructions: Download the full macOS installer

If you have used the link above (or the one listed below) and downloaded the patcher app, then open it. It may be that you have to enable permissions via the settings of the Mac, iMac or MacBook, as this is a third-party offer. If the software is running on your computer, these are the steps to take:

  1. Ignore all options related to patching and use on old Apple machines
  2. In the menu bar the item Tools call and Download macOS High Sierra ... click
  3. The download with a click on Yes Confirm and choose a storage location
  4. After the download is complete, in the "Download Complete" window Not now here
  5. The downloaded file "Install macOS High" is now the complete installer

Boot stick help: Articles about bootable USB sticks

macOS installer file for Sierra, Mojave and Catalina

On the DosDude1 website you will find an overview of other patcher apps in addition to the software page for the High Sierra Patcher linked above: Click here. This includes a macOS Catalina patcher, which is intended to install the 10.15 version, which will be released in autumn 2019, on older, actually unsupported Apple Mac models. 

With the versions for 10.12 Sierra, 10.14 Mojave and later also 10.15 Catalina, you can download the full installer using the same procedure as for 10.13 High Sierra. If you only get the help file measuring a few MB via the App Store, this may be exactly the solution you have been looking for to get the complete file measuring several GB;)

My tips & tricks about technology & Apple

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In the Sir Apfelot Blog you will find advice, instructions and reviews on Apple products such as the iPhone, iPad, Apple Watch, AirPods, iMac, Mac Pro, Mac Mini and Mac Studio.