PROBLEM WITH DOWNLOADING SUPPORTING FILES FOR INSTALLATION OF WINDOWS 8.1 IN IMAC

Hi Apple,

When i try to instal my new original windows 8.1 into my mac using boot camp.

1st step:

Open boot Camp

2nd step

it ask me download supporting software into to USB.

3rd Step i prompt as follows

"Can't install the software because it is not currently available from the Software Update server"

can you guys advice me ,how to solve this problem.