As many others have reported, the developer, Dean, seems to have disappeared, (at least he does not answer email requests for support), which is very unfortunate. If I remember correctly, this has happened in the past so I am keeping my fingers crossed.
I do like the software better than any I have tried. The interface window is clean and very easy to read. The setup is easy. There is a second window of extra sensors which, according to Dean at least a year ago, was going to be combined into the main window.