I upgraded to Lightroom Classic CC 8.3 when it came out. Then I upgraded my Nik Collection 2 from DXO and it appeared in the Edit In as usual. Then I upgraded to Lightroom Classic CC and the version is 8.3.1. Then the name change occurred at some point from Lightroom Classic CC to Lightroom Classic. Nik Collection 2 disappeared. I have tried to rerun the software about 3 times and then it occurred to me that the problem might be the name change. Lightroom Classic CC is the only choice on the list for installation of the Nik Collection 2 plug-in. Suggestions appreciated. The only work around is to go to the External Editing Tab and change the 2nd editor to one of the Nik apps and restart Lightroom.