The Undead Patch v 1.1 is now available here
http://www.natsam.co.uk/Natsam/Undead Patch.exe
The patch will fix all known bugs apart from the ending, and a few level changes have been made, to level 3, so there is now more health and more ammo, and the best thing is its under 22 meg!
Do not change directory unless you did so with The Undead the default directory is C:\Program Files\The Undead (then \files but do NOT change this)
If your undead directory is different, please change it accordingly.
If you are a newbie just leave it, it should be right.