The actually provided demo files will be substituted by a newer version soon.
The first beta version
is already available, but some functionality is still missing.
The experienced behavior usually is seen if a batch runtime error occurs.
Opening the command window first and then starting the batch file manually after setting the path correctly will show the error.
Did you try different packages (there are 4 of them for each language, and all come in two flavours)?
I tried most of them again and they worked on my machine...
Anyhow, the future version will be easier to work with and all is combined in one program now; what makes it easier to maintain and test.
You can already give it a try, the beta version is availble for download