Good point. I just checked my latest plug-in report from Cubase, and the actual Neutron 4 VST3 plug-in file path is:
\Program Files\Common Files\VST3\iZotope\Neutron 4.vst3
That said, I’m not seeing a reference to the iZNeutron4.dll file mentioned in the original post at all in my plug-in report, though I do see iZneutron4.dll appearing in my C:\Program Files\Common Files\VST3\iZotope directory.