Hi, I am looking to download a Sierra installer to create a bootable USB for another mac I have. Is this possible?? I've read online that it's not (https://www.macworld.co.uk/news/mac-software/impossible-download-old-macos-3684588/) but surely, there's got to be somewhere I can download the file. Do I really need to go and find someone with a mac and download it on their computer!!!?? That's beyond ridiculous. Thanks!