ZDE on 64-bit
In response to Greg's post (as I can not seem to comment to his message), and because I think this information is useful:
Ive recently tried to install my version 4 ZDE to my new workstation, an AMD64 machine, and ran into the same problem. I found a URL with a solution, though for a different Java application, worked for me.
First of all, you need to comment out all occurrences of LD_ASSUME_KERNEL in the installer. That should get your installer to work. Then, do the same on the installed ZDE binary. I got it to run that way.