How to Create macOS Catalina ISO File

Please note these steps need to be performed on a Apple Mac System to generate an iso.


1) Download macOS Catalina From App Store or Apple download

2) Please note once you download it will be in dmg format.

3) Open Terminal in MAC. from the top-right corner open up Spotlight. Type in Terminal and hit Enter.

4) Mount it to your macOS

hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina

5) Create macOS Catalina Installer

sudo /Applications/Install\ macOS\ --volume /Volumes/Catalina --nointeraction

6) Unmount Catalina Disk

hdiutil detach /volumes/Install\ macOS\ Catalina

7) Convert the DMG file to an ISO file

hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.cdr

8) Rename and Move to Desktop

mv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso

Now we can use this iso on any system and install on virtual machines.