The installer will delete itself when you install the operating system, but it can be re-downloaded if necessary. If you want a GUI, take a look at Ben Slaney's Install Disk Creator from MacDaddy. How do you create a Catalina Installer disk? All the online tutorials assume that the Catalina upgrade will be saved in the Application folder (as it was with previous MacOs Updates). But on my machine, the update is saved in the update section of System Preferences, so how do you turn that into a USB disc?

I see a few posts online with people using Install Disk Creator to make bootable install USB keys for re installing OSX, complaining that the key they made doesnt work!

Macdaddy Install Disk CreatorDisk

Trying to do a clean install of Catalina on my 2018 Mac mini that is currently running Mojave. The problem I'm having is that the USB installer is not bootable. In System PreferencesStartup disk, it does not appear as a startup volume. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. By continuing to use this site, you are consenting to our use of cookies.

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...but I see very few posts offering this very simple piece of advice to people who find the USB they made isnt working.


the program itself is VERY simple to use, you simply select the USB key you want to use (must be 8GB or bigger) and then point the program to the installer .app you want it to use, then just click 'create'


Macdaddy Install Disk Creator

simple enough, but if the installer .app you point it to isn't in the applications folder often the USB key you make wont work as it should.


I tried making an installer key with the .app on a network drive and on the desktop, and on both occasions it wouldn't work when I tried to boot from it.


When I used Install Disk Creator to create a bootable USB key installer, and asked it to access an OSX .app installer I was storing in my applications folder - bingo! works!


Macdaddy Install Disk Creator

hope this helps....

Macdaddy install disk creator windows 7

Macdaddy Install Disk Creator Review

Posted on Jan 11, 2019 6:42 AM