There are a number of different HDV images posted there, and I believe the one that I found it on was the "Board Games and RPGs" volume. Search for the CFFA review, and you'll find links to all of the 32MB images there. And as Castelian suggests, the easiest way to extract what you want from the hdv image is to use CiderPress. You can however use the images with a IIGS emulator. If I recall correctly, all you need to do is change the file suffix from hdv to 2mg.
Update: My memory seems to be failing me here. I just checked the most likely hdv images, and don't see Ultima there. I may have confused myself by installing the copy I bought to my downloaded copy of that hdv.
Last edited by Chuckles; 31 May 2011 at 18:51.