Though many people will disagree, installing an operating system like macOS isn't such a daunting task. If you're willing to follow the prescribed steps, you can do it even without having the expertise of a systems administrator. What makes it confusing is that there are usually several ways to clean install, re-install or upgrade macOS. Each type of installation requires a slightly different approach. In this article, we'll outline one of the simplest ways to clean install macOS Mojave from a USB flash drive. It's split up into four parts. Read each one carefully and make sure you understand what to do.

Part 1: Download macOS Mojave or High Serria DMG File

DMG is the format that Apple now uses for packaging software as a disk image. It's somewhat similar in function to ISO for Windows environments, but there are many differences as well. The one thing they can both do is to be burned as bootable media so an OS can be installed from a portable storage medium like a pen drive.

To download a macOS DMG file, you'll need to go to the Mac App Store and look at your Purchased section. If you already have it installed on that machine, it will appear there. You can also search for a particular version in the store. Make sure that once you download the file, it doesn't automatically start the installation. If it does, quit the process. You need the installation files, which will be deleted if the OS is installed.

MacOS Mojave, the latest version of the most advanced desktop operating system, is now available as a free software update for Mac users. MacOS Mojave brings a number of new features to the Mac, including Dark Mode which transforms the desktop with a dramatic dark color scheme, and a new Dynamic Desktop with a series of time-shifting images to match the time of day.

Part 2: Burn macOS DMG File to USB Drive

This step requires some care because you can't create bootable media by just copying a DMG to a USB stick. You will need a disk authoring software that can write the DMG file with all relevant boot information to make it bootable. If you cannot boot from the drive you create in this step, you can't proceed with the installation. You can use the third-party apps to burn DMG to USB and follow the steps shown below:

Step 1: Get the DMG file from the Mac App Store.

Download file - macOS Mojave 10.14 Install.dmg. Some our other sites that you can take much advantage from: MacDownload.ORG: Download Mac Software, App & Games Full version. After numerous problems cropped up on Macs with Safari 14.0 that later installed Security Update 2020-005 for Mojave, Apple pulled the updates and has now pushed out a supplemental update that replaces Safari 14.0 to fix the problems. Mac OS X Version 10.6 and below. Use Software Update available on the Apple menu to check that you have the most up-to-date version of Java 6 for your Mac. Java 7 and later versions are not supported by these older versions of Mac OS X. If you have problems with Java 6, contact Apple Technical Support. Mojave runs on any Mac that supports Apple's Metal graphic-acceleration framework, which means, in effect, any Mac desktop or laptop from mid-2012 or later. The only exception is the Mac Pro line: all models from late 2013 are supported, but 2010 and 2012 models require Metal-capable graphics cards.

Step 2: Install and launch DMG to USB burning utility such as UUByte DMG Editor, and insert a USB drive with at least 12GB of space (for macOS 10.14 Mojave; some require up to 16GB.) Since the drive will be formatted for the macOS installation, make sure you back up any important information that's already stored there.

Note: Your USB may need to be formatted with Disk Utility before it can be used to create bootable media. To do this, go to your USB drive within Disk Utility and click on the button or tab that says Erase. Now fill out Name, Format and Scheme fields, click Erase and Done. The format should be set to Mac OS Extended (journaled) and the scheme, if required, should be GUID Partition Map.

Step 3: Import the macOS installer and click the Burn function after selecting the appropriate USB drive.

Step 4: You may need to specify certain parameters such as burn speed, but in most applications, you can leave the default values as they are.

What you now have is a bootable USB drive containing the macOS installation files in the DMG format. The next step is to boot your Mac from this installer, and there's a special way to do that.

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Part 3: Boot Mac from USB

You can now insert your USB drive into the Mac you want to install macOS on. Restart the Mac, but when you hear the startup chime, hold down the Option (alt) key on your Mac until you see the Startup Manager. Several drives will be displayed, but only the ones that have bootable media installed. Pick your USB drive using a double-click with the mouse pointer or by using the arrow keys and Return (enter) on a keyboard. Now the Mac is booting from external USB.

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The process of installation has now begun. Let's go through the final steps to install macOS from USB.

Part 4: Clean Install macos Mojave or High Serria from USB

The last part of the installation process is simple. Just choose a language when prompted, and follow the instructions shown on screen as macOS Mojave is installed. You will need to first choose the right OS version and select Reinstall a New Copy of macOS. Click on Continue, and then on Continue again when the installer opens, and click Install to complete the process.

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This is one of the easiest ways to install macOS from a USB. You don't require any experience and you don't need any additional tools. The key things to be careful about are the creation of the bootable USB, formatting it properly and booting your computer from the media instead of from the regular installation files. If you can replicate the steps shown in this article, you'll be installing macOS like a pro in no time!

As we warned in “Security Update 2020-005 (Mojave and High Sierra),” (28 September 2020), users of macOS 10.14 Mojave who installed Security Update 2020-005 experienced numerous problems, as well-documented by Mr. Macintosh. Issues included large increases in memory usage, slow boots, overall system slowness, the inability to create new users, and more. Further discussion suggested that the problems might have been related to installing Safari 14.0 (released the previous week) before Security Update 2020-005.

On 30 September 2020, Apple pulled the updates for both Safari 14.0 and Security Update 2020-005. Then, late in the day on 1 October 2020, the company released macOS Mojave 10.14.6 Supplemental Update that, in fact, installs only a fixed version of Safari 14.0 and requires a restart. Apple also re-released Security Update 2020-005 with no changes.

Coverage from Mr. Macintosh suggests that the supplemental update fixes all the previous problems.

Precisely what you’ll see in Software Update depends on what you have already installed. Regardless, the practical upshot is that installing Security Update 2020-005 (if available) and macOS Mojave 10.14.6 Supplemental Update will give you both the updated Safari 14.0 and security update code. If you previously installed Safari 14.0, with or without Security Update 2020-005, we recommend installing this supplemental update immediately.

However, if you want to stay on an earlier version of Safari for some reason, you should be able to install Security Update 2020-005. Just don’t install the supplemental update, which will give you Safari 14.0.

We suspect that the new version of Safari 14.0 installed by the supplemental update addresses only the bugs that triggered problems once Security Update 2020-005 was installed. Quite a few people have reported separate troubles with Safari 14.0, and we’re guessing that Safari 14.0.1, now in beta testing, will address those.

Although Apple responded fairly quickly, it’s still a black eye for the company to ship a security update that caused such problems. In Apple’s defense, the situation was unusual, with the problems originating with the separate Safari 14.0 update and being revealed only after the user installed Security Update 2020-005. Nevertheless, we hope Apple is investigating how such major issues slipped through internal testing.

When we write about Apple’s operating system updates, we always try to offer advice about when to install. It’s now clear that we’ll need to make such recommendations for Safari and security updates in the future as well. The specifics may vary with the severity of the fixed vulnerabilities, but in general, we currently suggest that you should wait at least a week before installing updates like these.