is there progress with D6 support?
No.
I'm not really sure how much value there would be. When I wrote the original, there weren't really any "free" tools to do the job. Sometime after that, philmoz converted the disassembler and created the code_gen system (as well as making huge improvements to the sigfinder). So the need for the tool kind of went away.
I have some ideas about porting the code_gen stuff back into the tool to create a Gui for using it. But it has not been a priority.
P.S. link to executable is dead
Yes - for over a year now. Nobody has noticed until today.