Boot Camp Assistant Install Fails to install Windows 10 1709. "An error occurred while copying the Windows installation files." I'm trying to do a first-time install of Windows 10 1709 with Boot Camp Assistant. During installation, I receive the message: "An error occurred while copying the Windows installation files."

This leaves me with the extra partitions, which are cleaned up upon restarting my computer, starting Boot Camp Assistant, and letting BCA reset the partition.

I've tried booting into System Recovery, running csrutil disable, and retry the installation procedure, but I receive the same error.

Hardware: MBP 2017. 
OS: 10.13.3
I created a macOS tool to solve the problem and create a new ISO that works. I also wrote up an explanation. It is related max file size of FAT32 and how Boot Camp Assistant prepares the installation.

https://twocanoes.com/using-larger-windows-10-isos-with-boot-camp-assistant/