I didn't see that particular tutorial, but depending on exactly what
you're trying to do, using DecoderPro without a layout connection isn't
My guess is that you want DecoderPro to calculate various CV values
that you then manually program into your decoder.
If that's the case, just install Java and JMRI, and select "LocoNet
Simulator" for your layout connection. Then create a roster entry for
your loco, customize it the way you want on the various tabs, and read
the resulting CV values from the CV tab.
For help creating and customizing that roster entry, see Peter
Ulvestad's excellent "Programming a New Decoder" tutorial, linked to
here: . You would
follow those same steps, except that instead of writing from JMRI to the
decoder, you would note the CV values on the CV tab as outlined above.