Go into the folder where the plugin was installed and remove remaining manually.
Sounds good. Is there a default directory for those audio plugins for both CS6 and CC?
I finally figured out how to remove my duplicate plug-in.
So, I'm posting here, in case anyone else has this issue.
1. Uninstalled IzoTope Nectar Elements from Add/Remove.
2. Launched Premiere's Audio Plug-In Manager under Edit | Preferences | Audio. I could see that the VST plug-ins were still listed, even though they were uninstalled and no longer in their listed directories.
3. Clicked Scan For Plug-Ins button, which then removed them from the list. I also verified that they were no longer listed under Audio Effects.
4. Now that they were removed, I reinstalled Nectar Elements and then performed the same steps to Scan For Plug-Ins and have them show up again. No more duplicates listed.
Thanks for posting.