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pmullins11
Contributor
Contributor
‎10-08-2019 03:29 AM

Error when creating a macOS 10.15 Catalina guest using Fusion 11.5.0

Hello.

I just downloaded the official macOS Catalina install file and tried using it to create a 10.15 guest using Fusion 11.5.0. When I do so I get an "Unable to create the installation medium" error. Anyone know what might causing this? Thanks in advance!

Patrick

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6 Replies
sharkus
Contributor
Contributor
‎10-08-2019 11:57 AM

I'm also seeing the exact same issue.

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mncg
Contributor
Contributor
‎10-08-2019 01:24 PM

I have the same problem here. I worked around it by cloning a 10.14 VM and updating that to 10.15. That's not exactly the same thing but was sufficient for my needs.

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ctmorey
Contributor
Contributor
‎10-08-2019 01:37 PM

I got it to work by moving the installer to an external drive...

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sharkus
Contributor
Contributor
‎10-09-2019 03:26 PM

I thought I'd try creating a 10.14.6 VM and upgrading it, but Fusion 11.5.0 won't let me create a 10.14 VM either, returns the same message!

I had a quick search around and found this article about creating a VM for Mojave, I've tried it, replacing instances of Mojave with Catalina, and it seems to work so far. It at least gets me past the error and I can see the Apple logo as the machine boots.

The article is:

https://www.huibdijkstra.nl/how-to-set-up-a-osx-mojave-vm-in-vmware-fusion/

Essentially it's just using the createinstallmedia tool to create a local iso file from the installer, much as you'd do if you wanted the installer on a USB key.

I've also tried the suggestion of moving the installer to another disk, and that does seem to avoid the error. It does sit on "Creating new installation medium.  This may take a few minutes" screen, so I wonder if it's simply using the same process as mentioned above to create the installer iso file?

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rachelsunsm
VMware Employee
VMware Employee
‎10-10-2019 02:34 AM

copy installer to external drive also worked for me.

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mallea
Contributor
Contributor
‎10-28-2019 01:32 PM

I'm experiencing the same exact issue with Fusion 11.5.

I tried 1) moving the installer out of /Applications and that didn't work, and 2) moving the installer to an external USB stick (as recommended by others) and that didn't work either.

Very interesting that this doesn't work given the explicit support for macOS 10.15 mentioned in the 11.5 release notes...

Any other ideas?

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