Question: Boot Camp doesn't find Windows 8.1 ISO file
I have an early 2011 MacBook Pro with macOS High Sierra and I want to install Windows 8.1 using Boot Camp Assistant (the version I have is the 6.1.0). I have downloaded the 64bit ISO file from the Microsoft website, so I do not have a physical CD. Once I launch Boot Camp and check all the boxes, it says "Installation disc is not found, please insert the installation Windows disk, then wait a few seconds for the disk to be recognized". Does that mean I need to burn the ISO file to a CD without Boot Camp? I thought Boot Camp only needed the ISO file and that you could burn the file to a USB drive or CD through Boot Camp. Is there something I didn't correctly understand? Could it possibly be that my Boot Camp version doesn't recognize Windows 8.1?
Thank you for your help!
MacBook Pro, iOS 10.1.1