I've got my first VM up and running using the sample tools provided by Apple. Many thanks for the demo source code. Firstly, is there any official documentation from Apple regarding .ipsw files? I can't find anything doing a search through the general apple support site, although I see some results containing mention of Apple Configurator. Not being a sys admin, I'm not sure where that rabbit hole might lead. I've need had a need to deal with .ipsw files before. I see the majority of developers/users are accessing software from sites like ipsw.com. This is not something I am willing to do. I don't download or install software from unofficial sources. I can't believe others take this risk. I'm on an M1 Air, and I want to run older versions of macOS in a VM in order to set up testing environments for the various feature releases related to the Endpoint Security API. So running previous versions like 10.15, 10.15.1, 10.15.4, as separate VMs. Is this even possible using the VM technology, or will I have to resort to using multiple macOS installs on a single machine? The VM documentation does mention you can use .ipsw files instead of the built-in download feature, so how do I get hold of the ones I need, or how at least, do I create them from installer images?

Hi Quinn Thanks for the reply. I've gone through your steps twice and on both occasions as soon as I add the --oslog switch I get no ES output in the Console app. I'm running macOS 14.2.1 (23C71) I also ran the Console filtering for errors and faults while repeating your steps and nothing related to this appeared. It's not a massive issue for me, but it does seem very bizarre that this does not work as expected.