Trouble getting a bootable image for Fatdog64-710

[PappyPuppy]

Invalid Signature
Verification Failed
Failed to Load Image

I am running a laptop with Windows 10 on it. I made a CD with various tools - the built-in Windows, Infrarecorder, Cheetah, I believe ImgBurn. The CDs look reasonably normal:
help
boot.catalog
efiboot
fatdog
fix-usb.sh
grub.cfg
initrd
isolinux.bin
isolinux.cfg
vesamenu.c32
vmlinuz

I'm booting on a Windows 10 laptop that works. I have not tried to do things with loaders or partitions because I assume that I can just boot off of a CD.

Any ideas appreciated.
Thanks.