You can see all previous versions of OS X your Mac has installed by opening up the App Store and clicking the icon in Applications. Tab to the Purchase page of the menu and scroll down to find the line for previous operating systems. Clicking the install button of the macOS.

How to install the OS from USB 1. Plug in your bootable USB drive and Restart your Mac while holding the Option key. When it restarts, you’ll have a few options. Choose your USB Installer. Next, select the Disk Utility option. In the window, at the top of the left bar, select your Mac’s. Plug in the USB drive on which you want to install macOS and launch Disk Utility. If the USB drive currently has more than one partition, click on the Partition tab and use the minus sign to reduce. Jun 24, 2019 The upgrade install is by far the easiest method of upgrading your Mac to macOS Sierra. The upgrade install preserves all of your current user data, documents, and apps while upgrading the existing operating system on your Mac’s startup drive to macOS Sierra.

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Whether you want to occasionally test a website in Safari, or try out a little bit of software in the Mac environment, having access to the latest version of macOS in a virtual machine is useful. Unfortunately, you’re not really supposed to do this—so getting macOS running in VirtualBox is, to say the least, tricky.

It’s not impossible, however. Some of the folks at the InsanelyMac forums have figured out a process that works. The only thing not working is sound, which for some reason is highly distorted or nonexistent. Other than that, though, this is macOS High Sierra, running smoothly in VirtualBox.

To make things a little easier for people, we’ve combined methods from a few different forum threads into a single, step-by-step tutorial, complete with screenshots. Let’s dive in.

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NOTE: In order to get this working, you will need access to a real Mac in order to download High Sierra. You could, we suppose, obtain a High Sierra ISO by other means, but we don’t recommend it. Borrow a friend’s Mac for an hour if you don’t have one, and you should be fine—everything beyond step one of this tutorial can be done on your Windows PC.

If you’re on a Mac and want a macOS virtual machine for use on that Mac, we recommend checking out out Parallels Desktop Lite instead, because it can create macOS virtual machines for free and is a lot easier to work with.

Ready to get started? Let’s jump in!

Step One: Create a macOS High Sierra ISO File

To start, we’ll need to create an ISO file of macOS High Sierra’s installer, so we can load it in VirtualBox on our Windows machine. Grab your borrowed Mac, head to the Mac App Store, search for Sierra, and click “Download.”

When the process is done, the installer will launch—that’s okay, just close it with Command+Q. We don’t want to upgrade your friend’s Mac; we just need the downloaded files.

To convert those files to an ISO, we’ll need to use the Terminal, which you can find in Applications > Utilities.

First, run the following command to create a blank disk image:

Next, mount your blank image:

Now you’re going to restore BaseSystem.dmg from the installer over to the newly mounted image:

Note that, after doing this, the name of our destination mount point has changed to “OS X Base System/System.” You’re almost done! Unmount the image:

And, finally, convert the image you created into an ISO file:

Move the ISO to the desktop:

And you’ve got a bootable High Sierra ISO file!

Copy it to your Windows machine using a large flash drive, an external hard drive, or over your local network.

Step Two: Create Your Virtual Machine in VirtualBox

Next, head to your Windows machine, and install VirtualBox if you haven’t already, making sure you have the latest version (seriously, older versions may not work.)

Open it up and click the “New” button. Name your Virtual Machine “High Sierra,” and choose “Mac OS X” for the operating system and “Mac OS X (64-bit)” for the version (as of this writing, “macOS High Sierra” is not offered, but that’s fine.)

Continue through the process. For memory, we recommend you use at least 4096MB, though you can opt for more if you have enough RAM to spare on your Windows machine.

Next, you’ll be asked about your hard drive. Choose “Create a Virtual Hard Disk Now” and click Create.

Choose VDI for hard disk type and click Next. You’ll be asked if you want a dynamically sized drive or fixed. We recommend Fixed Size, since it’s a bit faster, though it’ll take up a bit more hard drive space on your Windows machine.

Click Next. You’ll be asked how big a drive you want; we recommend at least 25GB, which is big enough for the OS and a few applications. Depending on your storage situation, you could offer more, but we don’t think you can really use much less than that.

Click through the prompts, and you’ve created an entry for your virtual machine! Now it’s time to do a little configuration.

Step Three: Configure Your Virtual Machine in VirtualBox

You should see your virtual machine in VirtualBox’s main window.

Select it, then click the big yellow “Settings” button. First, head to “System” in the left sidebar. On the Motherboard tab, make sure that “Floppy” is unchecked.

Next head to the “Processor” tab, and make sure you have at least two CPUs allocated to the virtual machine.

Next, click “Display” in the left sidebar, and make sure Video Memory is set to at least 128MB.

Next, click “Storage” in the left sidebar, then click the “Empty” CD drive. Click the CD icon at the top right, then browse to the High Sierra ISO file you created earlier.

Be sure to click “OK” to finalize all the changes you’ve made, then close VirtualBox. No, seriously: close VirtualBox now, or the next steps won’t work.

Step Four: Configure Your Virtual Machine From The Command Prompt

We’ve made a few tweaks, but we need to make a few more more in order to convince the operating system it’s running on a real Mac. Sadly, there are no options for this from VirtualBox’s interface, so you’ll need to open the Command Prompt.

Open the Start Menu, search for “Command Prompt,” then right-click it and select “Run as administrator.”

You need to run a number commands, in order. Paste the following commands, pressing Enter after each one and waiting for it to complete:

That’s it! If everything worked, you shouldn’t see any feedback; the commands will simply run. If the command did not work, make sure your virtual machine is named “High Sierra” exactly; if it isn’t, edit the commands above putting your machine’s name in the quotes. Go ahead and close the Command Prompt. We’re heading back to VirtualBox now.

Step Five: Boot and Run The Installer

Re-open VirtualBox, click your Sierra machine, then click “Start.” Your machine will start to boot. You will see a lot of superfluous information as this happens—and I mean a lot—but don’t worry about it. It’s normal, even some of the things that look like errors.

You should only worry if a specific error hangs for five minutes or more. Just walk away and let it run for a bit. If you’ve done everything right, it’ll boot.

Eventually, you’ll see the installer asking you to pick a language:

Pick “English,” or whatever language you prefer, then click “Next.” Before you do anything else, however, click “Disk Utility” then “Continue.”

You won’t see the drive: don’t panic, High Sierra hides blank drives by default. In the menu bar, click “View” followed by “Show All Devices.”

You should now see your empty virtual drive in the sidebar. Click it, then click the “Erase” option.

Name the drive “Macintosh HD,” and leave the other two settings as-is: “Mac OS Extended Journaled” and “GUID Partition Map”. Do not create an AFS partition, because it will not work and you’ll have to start over

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