I have searched the net for Digitrax converter or complete Digitrax package, but I was unable to find it. I also checked Downloads section of this site. Does someone have some information about those programs, or maybe have them?

I's like to convert some smaller module files, to try them on the Enterprise.

Digitrax converter is part and a module of EDC windows, so you should download it, and start EDC windows, load the module into it, activate and then you can start conversion
It works good with old type mods, probably you will get huge amount of bad sounding output until you find a good one

Digitrax converter is part and a module of EDC windows

The original converter are batch of assembly files of Sandor Gyányi. It is not too user friendly: need to load first to ASMON, compile to memory, call it. It is make some temp files... load second one, compile to memory, call it, it is working on the temp files... etc,etc

EDC joined these and added some user interface to it