Unfortunately that is the problem with a single developer software - a sudden end. When Bill decided to end development in Nov 2007, Genbox was the best advanced genealogy software on the market (although never advertised), including features only now being included in existing software (for example, sources included with Pedigree charts). He had partially finished version 4, however I suspect the economy in late 2007 played a large part to his decision. Genbox works well with Win 8, Win 8.1, and Win 10. One can only hope that, since he still retains all copyright to the software code, that he will eventually resume development.