Resolved Catalina Dmg

[Stefanmz7]

Hey how can I get a dmg file for Catalina instead of the official app from the app store? I need just the dmg file. Can I get it from Apple?

 

[BrianBaughn]

Not from Apple I'm almost certain.

Also, I'm not sure a clone DMG of an installer would work. There might be something that requires it be built from the Catalina installer app. Someone else might know.

Either way there's no official way to get a DMG.

Is this a case of not having a working Mac to create the installer from the installation app?

 

[Stefanmz7]

Not from Apple I'm almost certain.

Also, I'm not sure a clone DMG of an installer would work. There might be something that requires it be built from the Catalina installer app. Someone else might know.

Either way there's no official way to get a DMG.

Is this a case of not having a working Mac to create the installer from the installation app?

No I just need it for a vm and I don’t know if a bootable usb with the app will be accepted by the vm for boot

 

[bogdanw]

You can create your own from the Install macOS Catalina app
Here's my method

hdiutil create 1015.dmg -size 8g -layout SPUD -fs HFS+J

hdiutil attach 1015.dmg -noverify -nobrowse -mountpoint /Volumes/InstallCatalina

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/InstallCatalina

hdiutil detach /Volumes/Install\ macOS\ Catalina 

hdiutil resize -sectors min 1015.dmg

 

[Stefanmz7]

Thanks that worked!