I have a gig coming up soon working on MacBooks and I don't have much experience with them. I did let them know this upfront but they assured me the tasks would be easy enough with my understanding of processes. We will be primarily copying files to USB drive, backup passwords, some screenshots and possibly some other tasks. Once this is done, we will reimage them. Even though they know my knowledge of MAC OS is limited, I would still like to be as prepared as possible. There will be MAC tech's onsite if I get stuck. My thought was to set up MAC Sierra, High Sierra or something similar in VirtualBox for some experimenting. How can I get a copy of one of these iso's without having a MAC to download it to?