Just to help, here's some extra info (I think)...
This version of the program runs like normal, only the difference in this "debug version" is when you try the command "dilc" or "dilconfig". Then the alert box will appear. Also, according to this part:
(setq debugf (open (setq logfilez (strcat Dil_installdir "\\DiLeader_Debug.log")) "w"))
there should be a log file in the folder "c:\Program Files\Ductisoft\DiLeader" at some point...
In AutoCAD 2015 it does run like it should, all fine thanks!
There is no log file however.
In case of ZWCAD:
See attachement, for what happens. The program does not work.
It seems the project is not loaded correctly.
Also, there is no log file in the folder.