How to Install macOS 15 Sequoia Beta on an SSD - External Hard Drive
You can run macOS Sequoia from the safety of a SSD without having to overwrite your current Mac software (or risk losing data). Switching versions is as simple as choosing a startup disk.
To install you'll need to download macOS Sequoia using one of two methods:
1. Download macOS 15 Sequoia Full Installer (non-developer): • How to Download macOS 15 Sequoia Beta...
2. Download macOS 15 Sequoia from Terminal (developer): • How to Download macOS 15 Sequoia Beta...
Install Steps:
1. Use "Disk Utility" to format your external SSD (256GB+) with AFPS
2. Download macOS Sequoia Full Installer (15.0, Beta 1+)
3. Run the "InstallAssistant.pkg"" to set up the "Install macOS 15 beta" app in Applications
4. Run "Install macOS 15 beta" from your Applications folder
5. Click Continue and Agree
6. Show All Disks... and Select your "External Hard Drive" and Continue
7. Copy Owner and Install (You can cancel before it finishes)
8. Your Mac will attempt to reboot (close other apps)
9. Your Mac will Install macOS 15
10. After the install finishes you may need to create a user to log in
@mrmacintosh has documented additional installers on his website: https://mrmacintosh.com/macos-sequoia...
You can read the release notes here (Apple developer): https://developer.apple.com/documenta...
00:00 Samsung T5 SSD
00:35 Download macOS 15
01:07 Disk Utility - Format SSD
02:26 Applications - macOS Installer
02:38 Show All Drives...
03:14 Start Installing
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