How to Create a Bootable Installer for macOS: A Step-by-Step Guide

Creating a bootable installer for macOS can be a bit tricky, especially if you're running High Sierra or later. But don't worry, we've got you covered. In this article, we'll show you how to create a bootable installer for macOS, even if it's an older version.

Step 1: Prepare Your Mac

Before we get started, make sure your Mac is running macOS Catalina, Mojave, or High Sierra. If you're running an earlier version of macOS, you won't be able to follow these steps.

Step 2: Download the Installation Files

To create a bootable installer for macOS, you'll need to download the installation files from Apple's website. Unfortunately, older versions of macOS are no longer available in the Mac App Store. However, there is a way to get them. If you're running High Sierra or later, you can download the installation files via Software Update.

Step 3: Create a Bootable Installer

Once you've downloaded the installation files, you'll need to create a bootable installer. To do this, follow these steps:

* Plug in an external drive with at least 15GB of free space.

* Launch Disk Utility (you can find it by typing 'Disk Utility' into Spotlight).

* Select the root drive from the sidebar and choose 'Show All Devices.'

* From the Disk Utility menu, select 'New Image' and then 'Blank Image.'

* Name your image file something like 'InstallOS.dmg.'

Step 4: Install the Installation Files

Now that you have a bootable installer, it's time to install the installation files. To do this:

* Locate the pkg installer inside the disk image.

* Make sure you close the Mac App Store before installing the files.

Creating a bootable installer for macOS may seem daunting at first, but with these steps, you should be able to create one easily. Just remember to download the installation files from Apple's website and follow the instructions carefully. If you have any questions or need further assistance, feel free to ask in the comments below.

Additional Tips

* Make sure your Mac has an internet connection before downloading the software.

* You may need an internet connection during the installation process if the version of macOS requires firmware updates or iCloud credentials.

By following these steps, you'll be able to create a bootable installer for macOS and install older versions of the operating system. Happy installing!

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