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Hi Eskimo, thank you for your kind reply! -- Did you run that command from within a Terminal window? Or via some other mechanism, for example, SSHing into the machine? I run a python3 script in Terminal.app. The script will fork process to run installer -pkg ... command. -- If you try this on a fresh machine, do you see the same hang? The issue is not always reproduce. When the installer -pkg ... command is stucked like the ps aux | grep installer result in my first post, I can run another installer -pkg ... command and this time it will be successfully done and the app will be installed correctly. My test environment is vmware VMs. I've tested it on 10.15, 10.15.7, 11.6.1, 11.6.2, 12.0.1, 12.1. This issue occurs only on 11.6.1, 11.6.2, 12.0.1, and 12.1.