How to install a Catalina VM on Catalina Host with Fusion 11.5

[mnahum]

Hello,

I tried multiple things ... but without success ... I need to install a Catalina VM on my Catalina host.

Fusion said there is no recovery to do it

giving the app file is not working

generate a dmg is not working.

any idea how to do?

[Mikero]

Giving it the .app should work, what's happening instead in your case?

[mnahum]

I had an error message: "Unable to create the installation medium"

To fix, I regenerated the media to a USB key with the proper commande and this time it worked...

[wqcoleman]

Me as well, cannot install the latest Catalina beta. 

Getting the following error "Unable to create the installation medium"

[bogdam · Accepted solution]

Create your own install media:

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\ Beta.app/Contents/Resources/createinstallmedia --volume /Volumes/InstallCatalina

hdiutil detach /Volumes/Install\ macOS\ Catalina\ Beta

hdiutil resize -sectors min 1015.dmg

Use the 1015.dmg in Fusion.

[d3photodotcom]

This worked perfectly. Thank you!

[d3photodotcom]

You should accept the answer using ​hdiutil​ as that resolves your issue.

[carbonrain]

This works flawlessly with macOS Big Sur. Thank you!

[salsafox]

worked.  thank you bogdam.   I also need to do this on an external HFS volume as the internal SSD gave errors.