I found the Python Brigadier utility on Github to download all BootCamp files for the current or a particular model of Mac. You can run it under OSX for download or Windows to download and install. It can force a particular model - like -m MacPro6,1 on a 5,1.
https://github.com/timsutton/brigadier
Very useful.
	
		
			
		
		
	
				
			https://github.com/timsutton/brigadier
Very useful.
 
 
		