Have you consider creating a movie with step by step instructions and posting the movie in youtube? I find that to be an excellent help in some instances.
Looking forward to see this component work.
We haven't seem this issue so far. It must be an issue with incorrect database credentials (host, db name, user or password) or could be a firewall issue of your hosting provider in case database is hosted on external server.
JConverter is pretty easy to use specially if you have used any other Joomla extensions. Did you contact our support team before coming to the conclusion that it doesn't work?