I have both nectar2 and nectar3 here, also running reaper.

I just checked my system, nectar2 is installed in Program Files->VSTPlugins and nectar3 is installed in Program Files->Steinberg->VSTPlugins

I never change the default path when installing iZotope plugins, so it seems that iZotope must have decided to change where to install the plugins at some point.

Do you see it there 2b?