How to Install macOS Big Sur in VirtualBox on Windows

It’s been a long time since Apple was a distant runner-up to Microsoft in the personal computer world. Still, Windows is the most popular desktop operating system (OS). If you’re primarily a Windows user, you may need to dip your toes in the Mac world infrequently. Instead of buying a MacBook, You could install macOS in a virtual machine on your Windows PC.

Can I Run macOS on Windows?

If you’re a Windows power user, you know you can run Linux or other versions of Windows within Hyper-V. If you’re a Mac power user, you know you can run Windows on a Mac with Boot Camp, or a virtual machine like VMWare Fusion, Parallels, or VirtualBox. But, can you run a macOS on Windows? You could run macOS on VMWare in Windows, but using VirtualBox is free.

You can install macOS in VirtualBox on Windows if you have:

• A legally obtained copy of a macOS
• At least 2 GB of spare RAM
• A 64-bit based CPU with at least 4 logical CPUs
• Administrator access on the PC

Fortunately, many computers today exceed the minimum hardware requirements.

Get a Copy of macOS

Open the Apple App Store and download a copy of BigSur. It’s an entire operating system, so it’s a large download. Make sure you’ve got the space and time to download it. If you don’t have access to download macOS BigSur from the App Store, we don’t recommend using other versions found on the internet, for security reasons.

Install VirtualBox on Windows

The newest version of VirtualBox that this process appears to work with is VirtualBox v6.1.26. Go to the VirtualBox 6.1.26 download site and select VirtualBox-6.1.26-145957-Win.exe. Also select the VirtualBox Extension pack Oracle_VM_VirtualBox_Extension_Pack-6.1.26-145957.vbox-extpack.

1. Install VirtualBox by running the downloaded installer.

2. When the VirtualBox installation is complete, Install the VirtualBox extension pack.

Create a Virtual Machine In VirtualBox

Think of creating a virtual machine as building a computer inside your computer. This gives macOS its own place to install to and allocates the resources it needs to work.

3. Select the New button.

4. Enter a name for the virtual machine in the Name field. A simple name is easier to work with, like macOS. Select where the macOS virtual machine will be installed in the Machine Folder field. For a multi-disk PC, pick a disk with at least 100GB of free space. If possible, pick an SSD disk. That will help performance. Or leave it as the default. VirtualBox will automatically set the Type to Mac OS X and Version to Mac OS X (64-bit) based on the name entered for the VM.

5. Allocate as much memory as possible for the macOS VM without exceeding 50% of total memory. Your PC still needs resources too.

6. Ensure that Create a virtual hard disk now is selected and select Create to continue.

7. Choose a hard disk file type. The default VHD is good. Or choose another one based on what you need.
   1. VDI (VirtualBox Disk Image): Only works in VirtualBox. If you might migrate the VM to another VM host like Hyper-V or VMWare, don’t choose this one.
   2. VHD (Virtual Hard Disk): Good for migrating the VM to Hyper-V.
   3. VMDK (Virtual Machine Disk): Good for migrating the VM to VMWare.

8.  If you’re creating the macOS on an SSD or nvMe drive, you can select Dynamically allocated. SSDs are fast enough to resize without affecting performance much. If you’re not certain, choose Fixed size. Select Next to continue.

9. On the File location and size screen, leave the default folder path. Allocate a minimum of 60 GB for the virtual hard disk. If you plan on installing several programs or upgrading the macOS to Monterey, use at least 100 GB. Select Create to continue.

10. When the VM creation process ends, select the macOS VM and select the Settings button.

11. Go to the System page then the Motherboard tab.In the Boot Order field uncheck Floppy. Use the up and down arrows to adjust the boot order so Optical is first, and Hard Disk is second. The defaults for the remaining options are good to leave as is.

12. Move to the Processor tab. Adjust Processor(s) to at least 2 CPUs. If your CPU has 4 cores and 8 logical processors, VirtualBox will show that you have up to 8 CPUs to use. Don’t use more than half. Leave Execution Cap at 100% and Enable PAE/NX should be selected by default as well. Select OK to continue.

13. Go to the Display page, then the Screen tab. Max out Video Memory to 128MB. Leave the defaults for the other options on this tab selected.

14. Go to the Storage page. Select Controller: SATA and then check the Use Host I/O Cache box. Then select the Empty storage device.

Select the DVD icon next to the Optical Drive field. Then select Choose a disk file. Navigate to where you stored the macOS .iso download and select it. Select OK to continue.

15. To complete the next step, exit VirtualBox. The next step won’t work if you don’t exit it or it keeps running as a zombie process. You will not be able to create the macOS VM. After closing VirtualBox, open Task Manager and ensure the process is not listed.

16. Go to GitHub and get the VirtualBox macOS codes. Copy them from there and paste them into Notepad. The codes will need to be edited to match your macOS VM situation.

If you installed VirtualBox to a location different from what’s shown in the first line, edit the first line to match.

In the remaining lines, change Your Virtual Machine Name to macOS, the name you gave this VM.

17.  Open the Command Prompt as Administrator. Copy the first line of code and enter it. This will change the base directory in the Command prompt to where you installed VirtualBox. Then copy, paste, and run each line by itself in the Command prompt. 

Install macOS Big Sur

1. When the last command finishes, close the Command Prompt and open VirtualBox again. Choose your macOS VM and select Start.

2. You’ll see a lot of white text on a black background. This can take a few minutes. If the white text and black background step continues for more than 15-20 minutes, it’s probably not going to work. You’ll see the Apple icon and a progress bar. If you get this far, it’s probably going to work. 

3. Next you’ll see the Language screen. Choose the language you prefer and select the next arrow to go to the macOS Recovery screen. 

4. Select Disk Utility.

5. On the Disk Utility screen, select the VBOX HARDDISK MEDIA in the left column and select Erase. 

6. It will ask you to confirm that you want to erase it. You need to give the volume a new name, too. Any name will do. Select Erase to continue.

7. Once the volume is erased and renamed, select Done to continue.

8. Close the Disk Utility window.

9. On the Recovery screen, select Install macOS Big Sur and then Continue.

10. It asks you to Continue again. Then it will ask you to agree to the software license agreement (SLA) twice. Agree if you want to continue.
11. Select the disk to install macOS Big Sur on. Only your macOS disk should be showing so click on that. Then select Continue.

12. It starts installing. The screen might say that there’s about 12 to 18 minutes remaining. It’s not correct as this part can take an hour. 

13. It will go to a black screen with white text, then to a gray screen with the Apple logo that says, “Less than a minute remaining…” There is a lot more than a minute remaining.

14. Eventually, you’ll see the Select Your Country or Region screen. You’re now in the setup of your freshly installed macOS. Go through the set up.

15. Once you’ve completed the setup, take a snapshot of the freshly installed state. This allows you to revert back to it easily should something go wrong with the macOS VM in the future.

Change the Resolution of the macOS Virtual Machine

If you prefer greater resolution than the VirtualBox default, you can do that too.

1. Shut down the macOS virtual machine and completely exit VirtualBox. 
2. Open the Command Prompt as Administrator.
3. Navigate to where VirtualBox is installed.
4. Enter the following command:

VBoxManage setextradata “macOS” VBoxInternal2/EfiGraphicsResolution 1920×1080

The last part of the command, 1920×1080 is the resolution. It can be changed to any of 1280×720, 1920×1080, 2560×1440, 2048×1080, 3840×2160, 5120×2880, or 7680×4320 supported resolutions. Some may not work for you though. After the command completes, restart VirtualBox and your macOS VM to make sure the change works.

Tips on Using macOS in VirtualBox

During the install, if you see a circle-slash like a no parking sign, the installation isn’t going to work. Shut the machine down as there’s no sense waiting.

Again, check to ensure that you applied the VirtualBox codes correctly. Completely close VirtualBox and reapply them if needed.

If that doesn’t work, change the VM settings to use less RAM or CPUs. Sometimes the PC can’t keep up with a higher setting.

Once the install is complete, you can change the VM settings to use more RAM or CPUs to increase the performance, as long as you’re not doing anything else on the host PC.

Enjoy your new macOS virtual machine!