I think the dev just took the free version and modified it. You can see this in the error messages  position of the screen elements  and overall conceptual design. After the new version there are issues with connecting to the server. From my work connecting to my home via the browser it works great. Connecting from my work to my home with the dsub product I get constant time-outs. I can do this back to back within a matter of minutes back and forth. It seems dsub has become unstable and unusable.
July 11 2016