How to download the macOS Sequoia developer beta

You can download the macOS Sequoia developer beta for free — right now. You can get a look at the exciting new features coming to the Mac before the update is shipped to everyone. Of course, there are a few things you should look out for. Beta software can be buggy and can lead to data loss or apps that don’t work. Not to mention, a lot of the most exciting features announced at WWDC24 aren’t included yet, like iPhone mirroring.

If you’re still sure you want to try it out, you should make sure you have a backup of your most important data with two copies of your photo library before you try installing. I’ll show you how.

How to download the macOS Sequoia developer beta

Table of contents: How to download the macOS Sequoia developer beta

1. Check that you have a Time Machine backup
2. Check that your photo library is backed up
3. Switch to allow beta software updates
4. Install the update

1. Check that you have a Time Machine backup

Before you download the macOS beta, you should make sure that your Mac is backed up. If you lose important data, if the software update is unsuccessful or if you want to roll back to the stable version of macOS after trying out the beta, this backup will save your skin.

Double-check in System Settings > General > Time Machine. Right under the name of your backup drive, there should be a line of text that says “Backups:” that lists the oldest and most recent backup. It should say “Today.” If not, you need to make a backup. To do so, right-click and select Back Up to “[disk name]” Now. (To be extra safe, you should have your Time Machine backup on an external drive.)

2. Check that your photo library is backed up

Next, open Photos. Scroll all the way down below the most recent photo to see if your photos are backed up. If it says “Synced with iCloud,” you’re golden. Otherwise, click Sync Now to make sure you don’t lose anything.

If your Mac has enough storage (or an external drive) you should have another copy of your photo library, too. Backing up to iCloud will help if something happens to your phone, but if a bug corrupts your photo library and those changes are synced to iCloud, a separate, offline copy will make sure you have a safe copy.

In the Dock, click on the Finder and open the Home folder with your name (⇧⌘H). Open Pictures. You should see a file called Photo Library. Make a local copy by clicking File > Duplicate (⌘D), or copy it to an external drive by clicking and dragging it over. Then, rename it something descriptive, like Photo Library (Backup).

3. Switch to allow beta software updates

Go to System Settings > General > Software Update. After it checks for updates, you’ll see the option appear for Beta Updates. Click the ⓘ tp bring up the pop-up menu, then click Off to see the options currently available: Off, macOS Sequoia Developer Beta, macOS Sonoma Public Beta and macOS Sonoma Developer Beta.

• The macOS Sequoia developer beta is the fast track, intended for app developers to test functionality and implement new features. This early in the process, the developer beta can be buggy and unreliable.
• In July, Apple will make a macOS Sequoia public beta available. This option will be a safer way to enjoy the prerelease software. When the public beta begins, updates will go out at the same pace, but released a day later to make sure there are no critical bugs in the software.

Click macOS Sequoia Developer Beta to get the flashy new update with all the coolest features like iMessage text effects, window tiling, a new Passwords app and more.

4. Download the macOS beta update

Click Done and you’ll see the macOS Sequoia update available. Click Upgrade Now to download the macOS beta and Install Now when it’s ready. It may take longer than a usual software update.

At the end, you’ll reboot into the shiny new beta operating system! You can expect to get a new software update about every few weeks until September. I also strongly recommend that you switch to the public beta when Apple releases those in July.