"...recently Google has updated the page for the Nik Collection (https://www.google.com/nikcollection/) to indicate that no future updates of any kind will be released. The existing Nik Collection (which is still available as a free download) will only function properly with Mac OS X through version 10.10, Windows through version 8, and Adobe Photoshop through version CC 2015."
Sad to lose the benefits of such capable software as our OS platforms develop.
Mike Brubaker