How to download and install macOS Catalina 10.15.3 beta 2 to your Mac

How to make an archived backup of your Mac with Time Machine

Before you begin, make sure you back up your Mac. The download and installation process is fairly easy, but any time you make significant changes to your computer, you risk problems. When it comes to securing your data, it is definitely better to be safe than sorry. Even if you just backed everything up the night before, make sure your Mac is completely up-to-date.

1. Connect an external hard disk or Time Capsule with a USB, FireWire, or Thunderbolt cable.
2. Click on the Apple icon () in the upper left corner of your screen.
3. Select System Preferences... from the dropdown menu.

4. Select Time Machine in the System Preferences window.

   

5. Turn the Time Machine slider On.

6. Click Select Backup Disk and choose the disk you'd like to use.

   Time Machine will format the hard drive for backups and start within two minutes.

How to download the macOS Catalina developer beta

Downloading the latest beta on your Mac is as simple as visiting Apple's developer portal.

1. Visit developer.apple.com on your Mac.
2. Click on the Dicover tab.
3. Click on the macOS tab.
4. Click Download.
5. Log in with your developer account if prompted to do so.
6. Scroll down and click on the Install Profile button for macOS Catalina 10.15. The file will automatically download to your Mac.
7. Open your Downloads window and select macOS Catalina Developer Beta Access Utility.
8. Double-click macOSDeveloperBetaAccessUtility.pkg to run the installer.

When the installer is finished downloading, System Preferences will automatically check for an update to macOS. Click Update to download and install the developer beta software. After the software has been downloaded, the installation process will begin as normal.

If the latest developer beta does not appear on the Updates list, restart your Mac. Then, open the Mac App Store and click the Updates tab.

The developer beta update can take a long time to finish downloading, depending on the size. You can check the status in the Updates tab of the Mac App Store.

How to install the macOS Catalina developer beta

After macOS Catalina is finished downloading, you will be prompted to install the software automatically.

1. Click on Continue.
2. Agree to Apple's Terms and Conditions.
3. Click on Install.
4. Follow the instructions to install macOS Catalina.

Your Mac will reboot to install macOS Catalina. You'll see a black screen with the Apple Logo and a progress bar. Grab a cup of coffee while you wait for the software to finish installing.

How to install the macOS Catalina beta on a partition

To keep your Mac's data from getting corrupted by a beta operating system, you can partition your Mac's hard drive to run macOS Catalina in tandem with your current operating system.

1. Create a partition on your Mac if you haven't already done so.
2. Select Continue when the download is finished and ready to install.
3. Agree to the terms.
4. Click Agree to confirm that you have read the terms.
5. Select Show All Disks to switch from your main partition.
6. Select the partition you wish to install the software on.
7. Click Install.

The installation helper will allow you to transfer information from your current operating system, or you could choose to do a clean installation to start your Mac from scratch.

How to get started with the macOS Catalina developer beta

Once your Mac reboots, you'll be set up with macOS Catalina. You'll have to follow a couple of steps to get started.

1. Click on Continue.
2. Sign in with your Apple ID and password. iCloud will sync your desktop and other files.
3. Click on Get Started.

You'll be directed to your Home screen where you can start digging around to find all of the fun new features.

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