A few hints:

Connect cable to COM2 on computer. I believe some monitors use slightly
different connectors at the monitor end, I'm sure you can figure that
out, no likelihood of damage so long as you get GND and 5V right.

Once you've unzipped and installed, you can get round the dongle by:

1) cd into the directory you installed into. It should contain a DAS.EXE
2) debug das.exe <enter>
3) e d476 <enter>             [it should reply 74.]
4) 75 <enter>
5) g <enter>

This changes the executable in memory so it only complains if you _do_
have a dongle, then runs it. You can also permanently change the das.exe
the byte you want is at offset 14D76h from the beginning of das.exe, change
from 74h to 75h. I use DISKEDIT that comes with Norton Utilities (for DOS)
as a convenient binary editor, but there are others.

The software comes via several continents and the internet, I got it in
exchange for working out the modification. I have only distributed it to
a few people who I feel I trust and who deserve it.

Another user tells me:
 "Now, there is one problem. You have to add all of the
  rest of the monitors in the STP files to the ZModels.db file with the
  correct monitor model N2H, X1, etc. using dBase3 or Borland's Paradox or
  the program won't see them. I added all of the Sun, SGI models I work on
  and DAS finds them correctly now."