Calterm configuration files

[JSSDiesel]

Working with a CM871, trying to upload ECM file with Calterm (just got Calterm and I'm trying to learn how to use it). I read through Rawze's posts on using Calterm but I'm confused about selecting the configuration file. When I go to browse there is a "BAC" folder for the 871 but its empty. Do I need to download the configuration files from somewhere before I can even connect to this ECM to upload it?