You have it, the HotU zip, and included is a flopboot.img (game is also on it) for dosbox, with a howto. Needs a clean boot to run the game.
You should be fine with what's in the mail, euuuuu..... my contra mail adr is a spam box, so if you should have probs don't use it, is useless.
BTW: weird little game. <_<
*Edit
Forgot to mention, but you can use that blood.img to write a bootable floppy and boot your PC with it, works fine on my AMD64 3500+, the speed is OK, good programmed lil'game.
('IF' you have a flopdrive, seems the modern PCs doesn't need those our days.)