How to Download and Install macOS High Sierra ISO File on Your PC

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macOS High Sierra, officially known as MacOS Sierra 10.12, is a major operating system update released by Apple Inc in September 2017 for its line of macintosh computers running the previous version Mac OS X El Capitan or later.

Why Choose to Download macOS High Sierra ISO File?

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While you can easily upgrade your existing macbook or iMac directly from Software Update within System Preferences, there are several reasons why some users might prefer downloading and installing a fresh copy of macOS High Sierra ISO file instead:

1. Clean Start: Sometimes, you may want to start afresh with an entirely clean slate without carrying over any third-party applications, preferences, documents or other clutter that has accumulated on your current system.

2. Compatibility Issues: If there are compatibility issues between certain software programs and the latest version of macOS installed on your macbook pro/air/mac mini, downloading a previous build like High Sierra can help resolve these problems temporarily until official updates become available from developers.

3. Legacy Hardware Support : Older MacBooks or iMacs running older processors may not be compatible with newer versions of MacOS due to hardware limitations; in such cases, sticking back on an earlier version like High Sierra which supports legacy chipsets could extend their useful life span further.

Download macOS High Sierra ISO File

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Clicking the following button will initiate a download process that will result in you obtaining a .iso file containing the installation media for Mac OS X 10.12 (macOS High Sierra) on your PC:

'Download Button'

Installation Instructions

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### Step 1 - Prepare Your External USB Drive

Before we dive into the actual installation process, it's essential to prepare a blank external USB drive (at least 8 GB capacity recommended) that will serve as our bootable media. If you don't have one handy, purchase or borrow an empty Kingston DataTraveler or similar-sized USB stick.

### Step 2 - Format Your External Drive

Next up is formatting the newly acquired USB storage device to a format compatible with macOS High Sierra installation process (macOS Extended Journaled). To do this:

1. Insert your external drive into any available port on either Windows or Macintosh computer.

2. Go to Start > Computer/This PC (Windows) or Finder > Devices (Mac).

3. Right-click on the External Drive icon and select Format from the context menu that appears.

4. In the format dialog box, select 'macOS Extended Jouringled' as the desired file system, then click Continue.

### Step 3 - Create Bootable macOS High Sierra USB Install Media

With your external drive now formatted correctly for installation purposes, we can proceed to create a bootable copy of our downloaded .iso image onto it:

1. Download and install Rufus (a free open-source utility) from the official website if you haven't already:

2. Launch Rufus on your Windows PC.

3. Insert the formatted USB drive into an available port on either a Mac or PC running 64-bit version of Windows 10/8/7 SP1 (or later).

4. Within Rufus, select 'Create bootable image' from the top navigation bar.

5. Select the downloaded .iso file containing macOS High Sierra installation media as your source drive and click Next.

6. Ensure that UEFI Boot is selected under 'Image Type', then hit Start to begin writing process - this may take several minutes depending on both computer specifications & available storage space remaining.

### Step 4 - Install macOS High Sierra

Once the flashing process has completed successfully, you should now see a new volume labeled 'macOS High Sierra' appear in your Computer/My Computer or Finder window. This indicates that Rufus has correctly created a bootable USB install media from our .iso file.

Now it's time to actually install macOS High Sierra onto your Mac:

1. Power down your macbook pro, iMac, etc., then press and hold the ⌘ + Option (or Alt) keys while simultaneously pressing the power button until you hear two distinct startup chimes - release all these held-down keys once you see a dark screen with an Apple logo in its center.

2. You should now be presented with an 'Install macOS High Sierra' boot menu; select your external USB drive containing our just-created installation media (it might say something like 'External Drive' or have the Mac symbol on it).

3. Follow through the rest of the guided setup process to complete the full installation, which will take anywhere from 30 minutes up to several hours depending upon factors such as:

- The age and specifications of your macbook pro/air/mac mini.

- Whether you're upgrading directly from El Capitan or switching from another operating system altogether (e.g., Windows).

- Any internet connectivity issues during the download & installation process.

And that's it! With these simple steps, you should now be running a fresh copy of macOS High Sierra on your Macintosh machine. Remember to always back up any essential files and data before proceeding with major software updates or clean installations.

2025.03

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