I want to use WinToUSB to transfer Windows 10 to an external SSD I have. I do not have access to a Windows PC, and so I though perhaps I could use VirtualBox to format my SSD and run the WinToUSB program. Will that work? Also, since I am unsure about how to do this, could someone provide a short step-by-step keyword guide? I understand I will have to get the Boot Camp drivers to the Windows OS somehow, but I am a bit confused about this. I appreciate any input and guidance! Anders Edit: I have a Windows 8.1 Pro key. Should I download the Windows 10 ISO file, or the Windows 8.1 Pro ISO file and upgrade to Windows 10 once installed?