#Macos catalina download beta how to#

Which you can rename to get rid of the unnecessary. It should say: created: /Users/foo/Desktop/ Convert the disk image to an ISOįinally, to convert the disk image to an ISO run: hdiutil convert ~/macOS-Catalina-Beta -format UDTO -o ~/macOS-Catalina-Beta.iso What did end up working for me is just to restart. Now you can kill that process with kill -9 3348 and try again but when I did that it didn't seem to work. Volume Install macOS Catalina Beta on disk4s3 failed to unmount: dissented by PID 3348 (/System/Library/PrivateFrameworks/amework/Versions/A/Resources/diskimages-helper) You can also try: $ sudo diskutil unmount '/Volumes/Install macOS Catalina Beta' Hdiutil: couldn't unmount 'disk4' - Resource busy The normal way to detach doesn't work: $ hdiutil detach '/Volumes/Install macOS Catalina Beta' You might see this in the output of the previous command: Install media now available at '/Volumes/Install macOS Catalina Beta' If you are like me then creating the bootable installer above would gotten rid of the /Volumes/install_build mount pointĪnd instead mounted it to /Volumes/Install macOS Catalina Beta.

Now the disk image ~/macOS-Catalina-Beta will contain the bootable installer. Press Y then return when prompted to erase the volume at /Volumes/install_build.Create the bootable installer in the disk image: sudo '/Applications/Install macOS Catalina Beta.app/Contents/Resources/createinstallmedia' -volume /Volumes/install_build Hdiutil attach ~/macOS-Catalina-Beta -noverify -mountpoint /Volumes/install_build Hdiutil create -o ~/macOS-Catalina-Beta -size 8000m -layout SPUD -fs HFS+J You should now have a file called /Applications/Install macOS Catalina Beta.app. Once it has finished downloading and it starts the installer, quit the installer.Where it says 'macOS Catalina Beta' click 'Upgrade Now'.Create a Time Machine Backup (just in case).

#Macos catalina download beta how to#

How to Create a macOS Catalina Beta ISO Prerequisits