
Afaf S. answered 07/19/20
Kind and Patient Tutor
With the CC 2017 update, Adobe has moved the installation location of Photoshop -- it's now normally found in /Applications/Adobe Photoshop CC 2017/. Unfortunately, this also moves the location of the Plug-ins folder.
You could try manually moving the Nik plug-ins yourself, but the easiest solution is probably just to download and re-install. (The installers can be found at https://www.google.com/nikcollection/.)