MacOS from Catalina onwards, a security change prevents non notarized apps from running. To get around this, you need to exclude the VCSA Installer from the MacOS Security Gatekeeper by removing the metadata quarantine attribute “com.apple.quarantine” for the VCSA ISO.
Before mounting the ISO, open Terminal and run the following command
sudo xattr -r -d com.apple.quarantine <Full Path to ISO>
Now you may mount the ISO and launch the UI or CLI vCenter VCSA Installer.
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