Trying to install Sequoia for Dual Boot with Tahoe.

kenfrompershore wrote:

I have a 2019 MacBook Pro running Tahoe. I now want to Dual Boot this with Sequoia. I have created an AFPS container and named it MACOS Sequoia & downloaded Sequoia. When I click on the installer I get a pop up that says. 'This installer cannot be used from the version of macOS you are running'. How do I install it?

Container is basically a Partition ?

I suspect adding a Volume instead of a Container...

Note: you can add a volume within the original container without penalty.

ref: Add, delete, or erase APFS volumes in Disk Utility on Mac

You can create a Bootable USB installer to install the OS there on your newly selected Volume

Create a bootable installer for macOS

when you boot up holding the Option key you can select the start up volume..

or the >System Settings>Startup Disk to choose a default

ref: Use more than one version of macOS on Mac - Apple Support

You need to use a bootable USB installer. Apple doesn’t recommend running long-term dual boot on two volumes in the same container, but I’m not sure how a separate container would affect that.

Create a bootable installer for macOS - Apple Support

For the bootable installer, you’ll have to enable external boot in the security set up, utility in recovery.

Your Mac is currently running Tahoe so the “Install macOS Sequoia” application installer that you are clicking in your Applications folder cannot be run.

Follow the guidance provided by both @leroydouglas and @Barney-15E and create a bootable USB installer on a flash drive. Then reboot your Mac from that to proceed.