As of today (April 11, 2016), Google's Nik Collection isn't compatible with the most recent Mac OS: 10.11 (El Capitan). I can't find a way to contact a person at Google. The support site says they update periodically and automatically send out the updates, but the most recent one was July, 2015, and it didn't fix the El Capitan problem. I'm posting this under B&W because Silver Efex Pro 2 and Color Efex 4 are the parts of Nik I'm most interested in. Does anyone have any information about this? Has anyone used Nik successfully with El Capitan?