This post is from the WWDC26 Virtualization Q&A.
Trying to virtualize macOS 27 on a 26.6 host failed at 77% install progress, even with Xcode 27 beta installed. But worked fine on a macOS 27 host. Are there any tricks to use a 26 host? Thanks!
A macOS 27 guest should run on a macOS 26.6 host, but we discovered a late incompatibility between the VZMacOSInstaller API on macOS 26.6 and the macOS 27 IPSW.
Unfortunately the best workaround I can think of at the moment is creating a VM on a macOS 27 host and then moving it back to your macOS 26.6 host. I understand this is not ideal. I'll see if we can find a better workaround for you.
