How to install macOS Big Sur public beta 4



Steps to install it on Based on separate partition

macOS:Following the release of the public versions of iOS 14 and iPadOS 14, Apple is now seeking public access to the beta version of macOS Big Sur. The next big update for macOS is the jump to 11.0, and with that comes some big changes. The most visible difference, though not necessarily the most notable, is the revised design. Everything seems a bit cleaner, with a look that is starting to look like iOS.

In this article, we’ll walk you through the news and how to get into beta on your computer, if you like. Once you install the beta version, you will likely receive more updates between now and the final version, which we hope will happen later in 2020.


First of all, the usual warning: you need to think twice or even three times before installing this software in your car. If you trust your computer to meet deadlines or other important work, using a beta version may not be the best idea. Apple beta versions are usually pretty polished, but there is always the possibility of application incompatibilities, degraded performance, and data loss.

There is a way to avoid some of this possible drama. If you are using a device with macOS High Sierra or later, you can use built-in tools to partition your hard drive so that the beta can live in isolation. This way, you can test the new features and then boot to the macOS stable partition with the rest of the data when you’re done. We will go over this below.

Second, make sure you have about 20GB of available hard disk space before attempting the installation. The first public beta is 12.3 GB.

If you have not previously installed a public beta, you will need to register to access that page with your Apple ID. If not, keep clicking “Register your devices” in the upper right corner of the web page.
Click on “macOS”, the middle option in the center of the next page.
Scroll down until you find a button that says “Download the BOS Ad Access Utility for macOS.” If you have not yet registered your Mac for the Beta program, click on it to download a .DMG file, which will be registered on your computer. Otherwise, you can skip this step.
When you start the installer, you will be asked if it does not detect a time machine backup. It’s a good idea to make a backup if you are installing on a machine that you trust a lot.
Finally, go to “Software Update” in the System Preferences app (if it doesn’t open automatically) to install the beta version. It may not be available to you right away. You will receive a notification once it is.
The 12.3 GB file will take some time. Once you’re done and before you get to the installation, feel free to follow the steps in the next section if you want to load it on a separate partition, rather than the main part of the drive.


Open Disk Utility (a built-in application that you can open by typing its name in Spotlight’s search bar) and your hard drive partitions will appear under “Internal” on the left side of the window. You may only see one.
If you are using a device with macOS High Sierra or newer, clicking on the primary partition should reveal that it is an “APFS volume”. If so, you can simply click the plus button over the word “Volume” in the upper left corner of the Disk Utility window to create a new volume.

You can name the desired volume, then click “Add”. Because APFS-formatted storage is spanned across volumes, you don’t have to worry about how much space to reserve on the new volume when you create it.
(Note: If your machine’s drive is formatted in Mac OS Extended instead of APFS, you can select the “Partition” button at the top of the Utility Disk window. You will need to name the partition and then decide how much storage you have. I wish you had that part of your hard drive. Since the above public bets are over 10GB, I suggest at least 30GB is safe).
Now that you have another volume (or partition), you can choose to install the beta version instead of the main drive

To switch between volumes or partitions, you will need to reboot the machine and hold down the Option key during startup.

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