If you downloaded your copy of Windows 10 you'll need to correctly copy it onto a USB Flash Drive. If you purchased your copy of Windows 10 on a USB Flash Drive you can skip to this step.

Be sure to only download Windows 10 from the Microsoft site to avoid malware. I was unable to enter a Windows 7 or 8 product key in the Windows 10 installer (it won't ask if it auto detects Win 7 or 8 previously installed). You can also download Windows 10 as a free download from Microsoft, but you will need a valid Windows 10 product key to activate at some point. I was unable to use Disk Utility or Boot Camp Assistant to properly create the Windows 10 USB Flash Drive from my OS X 10.10.4 Mac as of August 2015. iso disc image to a 4GB or larger USB Flash Drive, and this step is best done from a Windows computer. Purchase Windows 10 as a download from the Microsoft Store or Amazon.

If you buy the Windows 10 Pro version it includes the installers for both the Pro and Home 64 bit versions. Purchase Windows 10 on USB flash drive from the Microsoft Store, Amazon or a local computer reseller. Once it's done, unmount the USB drive (right-click and select Eject) from the desktop.Microsoft makes it easy for existing Windows 7 and 8 users to get a free version of Windows 10 from within Windows, but for a new installation of Windows on a MacBook that has never had a copy you'll want to look at the following methods: Boot Camp Assistant will create the bootable Windows 10 USB.Select the Windows 10 ISO image from Mac's internal storage and select Continue.Select Continue, and check the option to Create a Windows 10 or later install disk.Go to Finder > Applications > Utilities and launch Boot Camp Assistant.To create a bootable Windows disk using BootCamp: You will also need a 16GB USB disk, alongside the Windows ISO file for this method. Note: You can't use Boot Camp Assistant on Macs with Apple M1 chips. You can also choose to install additional Windows support software, which will be helpful if you are planning to use the bootable disk to install Windows on your Mac. This is an easy method and requires no additional software to be installed. If you have a Mac with an Intel processor, you can also use BootCamp Assistant to create a bootable Windows installation USB disk. Method 2: Create a Bootable USB Disk Using BootCamp Assistant

Boot camp assistant windows 10 usb