Boot Camp Assistant fails to copy windows installation files

I have been struggling to get Windows 8 installed on a brand new Macbook Pro Retina. It seemed simple enough to just run Boot Camp 5 with a 16GB flash drive in the USB port and a Windows 8 Professional ISO sitting on the desktop with the intent of creating a bootable USB drive, but it's not working for me. After selecting the path to the ISO file, boot camp proceeds to format the flash drive, create the WININSTALL partition, and attempt to copy the contents of the ISO to it, but it fails.
The error message isn't all that helpful, but the console logs seem to indicate that there is some sort of problem remounting the flash drive after formatting:
5/15/13 2:05:05.609 AM fseventsd[40]: could not open <</Volumes/WININSTALL/.fseventsd/fseventsd-uuid>> (No such file or directory) 5/15/13 2:05:05.609 AM fseventsd[40]: log dir: /Volumes/WININSTALL/.fseventsd getting new uuid: FD5D8B3E-A08E-4710-8925-CAA898FA70C3 5/15/13 2:05:05.679 AM fseventsd[40]: Events arrived for /Volumes/WININSTALL after an unmount request! Re-initializing. 5/15/13 2:05:05.679 AM fseventsd[40]: creating a dls for /Volumes/WININSTALL but it already has one... 5/15/13 2:05:07.176 AM diskmanagementd[857]: mount blocked by dissenter PID=857 (/usr/sbin/diskmanagementd) status=0xf8da0003 log=kDAReturnBadArgument message=(null)
I have tried rebooting, removing and re-inserting the flash drive, mounting, umounting, and reformatting. Boot Camp always winds up in the same place.
Any hints as to what might be going wrong?

Thanks for the note. But neither link lists our MacBook Pro mid 2014.
And how can I use Boot Camp Assistant to write the Windows.iso to USB-stick because it forces the download of support software (it is selected and grayed out).
The following page recommends using BCA for the MBP mid 2014.
https://support.apple.com/en-us/HT204048
I guess I could write the Windows.iso to USB using Windows (in fact I already did and it boots the MBP) and then try if the aforementioned software packages (which one?) contain necessary drivers for our MBP.
But I'd rather do it the recommended way letting the Boot Camp Assistant do the dirty work.

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shelleykapowski wrote:
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Hello all
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OS X Yosemite
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Boot Camp Assistant fails to copy windows installation files

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