Downloaded Nik Coll. 4.3.0. In the OS, it shows that it is located in PSE 2020, under "Plug ins". Opened PSE, then Edit-Preferences-PlugIns. Chose file: C:\ProgramFiles\Adobe\PSE2020\Plug-Ins\DxO Hit OK. Check Filter and nothing is there. Restarted computer. Still nothing in PSE. What am I doing wrong?
You just mentioned "this new upgrade". Is this a PSE upgrade or a Nik upgrade? At the very bottom of the Help > System Info... window is a line that tells if any plugins failed to load. Check your System info.