Mac Catalina Iso

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  1. Download Mac Catalina Iso
  2. Macos Catalina Iso Virtualbox
  3. Macos Catalina Iso
Mac Catalina Iso

Prerequisits

  1. Sign up for the Beta Program https://beta.apple.com/sp/betaprogram.
  2. Create a Time Machine Backup (just in case).

Download the Beta

Mac Catalina Iso
  1. Cmd + Space -> Software Update.
  2. Where it says 'macOS Catalina Beta' click 'Upgrade Now'.
  3. Once it has finished downloading and it starts the installer, quit the installer.

You should now have a file called /Applications/Install macOS Catalina Beta.app.

Create the bootable installer

  1. Create a disk image:
  1. Attach the disk image:

* NOTE: There is an additional .dmg suffix, you must add that.3. Create the bootable installer in the disk image:

  1. Add the prompt, enter your password.
  2. Press Y then return when prompted to erase the volume at /Volumes/install_build.

Now the disk image ~/macOS-Catalina-Beta will contain the bootable installer.

Unmount the disk image

If you are like me then creating the bootable installer above would gotten rid of the /Volumes/install_build mount pointand instead mounted it to /Volumes/Install macOS Catalina Beta. You might see this in the output of the previous command:

Download Mac Catalina Iso

This seems to be a real pain to unmount.

The normal way to detach doesn't work:

You can also try:

Mac Catalina Iso

Now you can kill that process with kill -9 3348 and try again but when I did that it didn't seem to work.

Macos catalina iso

What did end up working for me is just to restart.

Macos Catalina Iso Virtualbox

Convert the disk image to an ISO

Finally, to convert the disk image to an ISO run:

It should say:

Which you can rename to get rid of the unnecessary .cdr suffix:

If it still says:

Macos Catalina Iso

Then you still need to get rid of that pesky mount point.