Well I'm unsure what is wrong but there is something that caused me problems in finding the Nik filters. Nik Collections in the drop down Filters menu is greyed out and unusable of course, unless you have a filterable layer active. But other than that, the collection is working for me in PhotoShop by also using File\ Automate\ Nik Collection Selective Tool. This opens (and closes) a tool palette that accesses all the filters except HDR Pro. That is accessed from File\ Automate\ Merge to HDR Pro. I, however, access Merge to HDR from the Bridge. There is a video that may be helpful here that covers Nik Col. access in four different programs including PShop Accessing the plug-ins from host applications - Nik Collection Help
... View more