Have you gotten it to work it already in C-Script? If so, it's easy to convert it to Lite-C; just write "function foo();" instead of "dllfunction foo();". The engine automatically detects dlls in the acknex_plugins folder. More in the manual.

I don't know much about this particular dll, though, so I can't help you if you've already tried that and it didn't work. Most likely problems: the dll isn't specifically designed for acknex use, or it relies on obsolete features like execute() or the old flag-setting method.

Good luck on your project.