
You can just Quit Boot Camp Assistant.Īnd, there's your completely Win10 installer drive, all ready to plug in your PC and boot. (My flash drive takes about 30 minutes, so be patient) Boot Camp should ask for your admin password at the completion. Your USB drive should already show as the destination, so click Continue. Browse to your Windows 10 ISO, or just drag that ISO to the ISO source line.

This is assuming that you have access to a downloaded Windows 10 ISO, and that you have the USB drive that you want to use for the install plugged in to your Mac. Uncheck choices so that ONLY "Create a Windows 7 or later version install disk" is selected. Get the screen where you can select Tasks - should be the second screen after BCA launches. I recommend trying the BootCamp assistant again. I use the BootCamp Assistant, which you say does not work for you.

I have made bootable Win10 installers a couple of times in the last month.
