I tried that ISO and, yes, it certainly does boot. As the other posters said, check the MD5 matches up.
I burnt good copies with Prassi Primo & also with ECDC5. You must burn using these packages' *image* setting ie not just the file... otherwise you just end up with a backup copy of the downloaded ISO file on the CD and that certainly doesn't boot:~/
If you have got the bootable floppy made, I think there is a way of booting up on the floppy and then pointing the install process to a file on the hard drive (as opposed to a separate CDROM drive).
best wishes, Robert