Create a windows 10 boot usb for pc on a mac

broken image

It right away asked for the ISO and started downloading Windows support software, took forever, and then said there wasn't enough space on the partition (there was). My Boot Camp assistant seems to be having problems (first I get not enough space, 40 GB, etc.) which I fixed by making a partition using Disk Utility, but then I didn't get an option that others seem to get to Create a usb bootable drive for windows 7 or later.