Visit this page and download the ISO image directly from Microsoft. Downloading Windows 10 ISO from Microsoft By the way, whenever you want to re-enable this feature, follow these steps and type csrutil enable instead. Restart your MacBook and move on to the second step. Here are the things you need to do make this work: Of course, I tried manually creating a partition using Disk Utility, but booting from USB to carry out the operation didn’t work. The damaged optical drive was a setback and a bootable Windows 10 installation USB drive didn’t work. Over weekend, I had to partition a MacBook Pro and install Windows through Bootcamp. Also, if you have a bootable Windows 10 USB drive, you might still be out of luck. An external drive might not work and mounting an ISO most likely won’t work too.

A Windows installation DVD is required and it gets worse if your optical drive is damaged and won’t read the disk. On older MacBooks that ship with optical drives, this luxury is unavailable.

Installing Windows on newer MacBooks with no optical drive is almost a breeze, all you need is a USB drive to get things done.