Prompted to download the ldlinux.sys and ldlinux.bss files to begin the process, however, Rufus never made the connection to http://rufus.akeo.ie/files/syslinux-6.03/ to retrieve these files and just hung the software.
-goto https://mirrors.edge.kernel.org/pub/linux/utils/boot/syslinux/Testing/6.04/ or for stable releases here -download the syslinux-6.04-pre1.zip -unzip ldlinux.bss and ldlinux.sys from syslinux-6.04-pre1.zip\bios\core
-copy those two^ into my RufusDIR\rufus_files\syslinux-6.04\ directory -rerun Rufus
src - https://github.com/pbatard/rufus/issues/487#issuecomment-476452172
origin - https://www.pipiscrew.com/?p=15642 rufus-not-downloading-ldlinux-sys-and-ldlinux-bss-files-automatically