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Once you have those two things the process. What you need to make a bootable USB for Mac There are two main things you'll need to make your bootable install: a USB stick and the installation files. I used it to get Windows installed on a new PC. If you can use Ubuntu either via another machine or a simple Bootable USB version (I only had a Mac and a Windowless PC - and nothing I did on Mac properly allowed the Windows boot drive to actually launch from BIOS), once you get the Windows.ISO onto Ubuntu you can use WoeUSB (this tutorial helped me a lot) to make a nice bootable Windows USB.