Mac Catalina Iso

How to Create a macOS Catalina Beta ISO. GitHub Gist: instantly share code, notes, and snippets. A clean ISO of Mac OS Catalina. 2021-03-12 15:34:04. Internet Archive HTML5 Uploader 1.6.4. SIMILAR ITEMS (based on metadata). First, download MacOS Mojave installer, or the MacOS Catalina installer (or the installer you wish to turn into an ISO) from the Mac App Store. When the “Install MacOS Mojave.app” or “Install MacOS Catalina.app” application is fully downloaded and within the /Applications folder, proceed. Next, open the Terminal application.

Prerequisits

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

Download the Beta

  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.
Mac Catalina Iso

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.

Catalina

Unmount the disk image

Mac Os Catalina Iso

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:

This seems to be a real pain to unmount.

The normal way to detach doesn't work:

You can also try:

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

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

Convert the disk image to an ISO

Macos Catalina Iso Reddit

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

Iso

It should say:

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

Mac Catalina Iso Download

Iso

If it still says:

Macos Catalina Iso Virtualbox

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