Here is the link I mentioned in post#4. It seems to work offline but I have no idea if it works online or not. I had to extract it with WinRar, otherwise the file thinks it is password protected. I couldn't get the install to work on my WinXP computer so I just clicked on the DL40.exe file. These old DOS programs would rather be on a computer with Win98 or earlier.
Link:
http://www.software.rockwell.com/download/other/zip/dl40 .zip
Edit:
I have pdf's of the DL40 and the DL40+ manuals but they are too large for me to post. Let me know if you need them and I will upload them to to a fileserver.