Install any available updates from here, too. Next, boot into Windows and launch the Apple Software Update application. Select the Updates tab and ensure you have the latest version of Mac OS X and your Mac’s firmware. Potentially you could burn the Windows 10 ISO to a DVD disc and boot that on the real PC. To do this, boot your Mac into the OS X system, log in, and open the App Store app. Not all PCs support booting from USB and some may need their BIOS settings adjusted to enable this. This tool is mainly for creating Linux install drives but apparently can also be used with a Windows 10 ISO image to make a Windows 10 install drive. It is bootcamp limited your option, not your cMP. 3) you can install whatever Windows version you want natively. In this case you maybe able to do this using the free Unetbootin tool. 2) there is absolutely no need to touch bootcamp at all no matter you want to partition a hard drive, download the bootcamp driver package, or install Windows. If however you want to create a bootable Windows USB installer for use on a real PC not a Mac then Boot Camp Assistant is not suitable. If your Mac does not support this new feature it should offer the option to create a USB install drive which needs to be a USB2 drive of 8GB or greater in size.

See Boot Camp for Mac: Install Windows on your Mac without using a USB hard drive or flash drive USB stick and purely by copying the ISO in to the Windows partition it creates. Some newer Macs can do this without needing any external boot drive e.g. Such tool automatically finds the suitable driver for your Mac or Windows OS. If you want to install Windows 10 on to a Mac to use via Boot Camp then using the Boot Camp Assistant is the best option. If you are unable to download Boot Camp drivers on your Mac computer for some reason or want to download Boot Camp on a Windows PC, you can use a third-party tool.

How to update boot camp assistant