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The problem persists as of Beta 8.
gmpalter
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It looks like this bug is fixed in macOS Big Sur beta 9. Can you confirm?
Someone using Virtual Buddy discovered a way to enable updating a Sonoma VM to a later beta release. I tested it myself and it works although you may have to refresh the Software Update panel a few times before it sees the later beta. Apparently, it's a one shot deal. To update to a subsequent beta, you have to run the script again.
Here's a link to the script.
You need to install the Xcode 16 beta. It has the required updated components to allow the installation.
Before installing Xcode 16, I got the same error trying to install Sequoia using UTM. After installing Xcode 16, UTM was able to install Sequoia.