Installing windows 8.1 and using Boot Camp 5.0
By installing Boot Camp the normal way and using Full Windows 8.1 disc .
I was able to install it on my New Macbook 2013 and up.
The Drivers for Boot Camp 5.0 works for Windows 8.1.
Boot camp for Windows 8.1-OTHER, Mac OS X (10.7.5), Installing Boot Camp on Windows 8.1