I set up Boot Camp on my MBP (2014 model) installing Windows 8.1 (I want to use Windows 10, which is supported) but the boot camp wizard did not seem to work with Windows 10 for some reason - possibly me choosing the wrong variant of Windows 10 from the MSDN page?
I tried the "Media Creation Tool" in windows to upgrade from 8.1 to 10 but this failed with a message about the tool not working for my version of windows.
I have downloaded a windows utility for creating a bootable USB using an ISO file. I then created an install USB for windows 10 on my USB drive. When booting and holding the option key, I see three options: Mac, Windows and the USB drive. If I select Windows it just boots as usual ignoring the USB drive. What happens if I select the USB drive? Will it install window 10 onto my windows bootcamp partition (as I want) or will it try to install it on the USB drive?