As many of you may know, Google acquired the software development company behind the Nik collection of software (Silver Efex Pro, Color Efex Pro, Sharpener Pro etc.). It is now pretty clear that Google is entirely focused on mobile software development and places little value on tools for serious photographers. The good news is that you can download the entire suite for free here: https://www.google.com/nikcollection/. The bad news, admittedly speculation on my part, is that further development of these products will cease.
Given that the tools are pretty mature and valuable, we should not complain too much.