Just looking at the download page - I notice the SDK is written for Borland Delphi. I wonder if the move to freeware signals that they are no longer going to be using Delphi and hence the program development has reached its end?
I certainly hope not. I purchased version 1 and had version 2.3 installed (the last commercial version).
I suppose it should at least keep working for a reasonable length of time since it is Windows 7 compatible.