How to Create a Bootable Installer for macOS High Sierra

If you want to install macOS High Sierra on a computer, but don't have a physical copy of the installation media, you can create a bootable USB installer using an external drive and the installation files. This process may seem daunting, but it's actually quite straightforward.

Step 1: Prepare Your External Drive

To start, make sure your external drive has at least 15GB of free space. This is because the installer will require this amount of space to download and install macOS High Sierra. Plug in the external drive and launch Disk Utility by pressing Command + spacebar and starting to type 'Disk Utility'.

Step 2: Download the Installation Files

Once you have launched Disk Utility, you'll need to download the installation files for macOS High Sierra. You can do this by visiting the Apple website and downloading a disk image named 'InstallOS.dmg'. This file will contain the installer package that you'll use to create your bootable USB drive.

Step 3: Extract the Installer Package

Once you've downloaded the disk image, you'll need to extract the installer package from it. To do this, simply open the disk image and locate the 'pkg' installer inside. If the disk image is already open, make sure to close the Mac App Store before clicking on any of the links or they won't work.

Step 4: Create the Bootable Installer

With the installer package extracted, you can now create your bootable USB installer. To do this, simply copy the installer package to your external drive and follow the prompts to create a bootable installer for macOS High Sierra.

Important Notes

It's worth noting that Apple stopped making older versions of macOS available via the Mac App Store when they launched High Sierra. This means that you'll need to download these older versions using Safari or another web browser. Additionally, if you haven't yet installed macOS Catalina, Mojave, or High Sierra on your computer, you won't be able to download the installation files for older versions of macOS.

Creating a bootable installer for macOS High Sierra may seem like a complex process, but it's actually quite straightforward once you know what steps to take. By following these steps and downloading the necessary installation files, you'll be able to create a bootable USB drive that you can use to install macOS High Sierra on your computer.

Bootable High Sierra USB

In this article, we've shown you how to create a bootable installer for macOS High Sierra using an external drive and the installation files. By following these steps, you'll be able to install macOS High Sierra on your computer without having to purchase a physical copy of the installation media.

I hope this helps! Let me know if you have any questions or need further clarification on any of the steps.

Bootable high sierra usb