Well the plug-ins should exist in c:Program FilesAvidAVX2_Plug-Ins so if they are not there then re-installing the Avid software simply blew them away. If they are there then the link to the MC may have been damaged when you re-installed the Avid. Either way, it wouldn't hurt to reinstall the plugs.
If after re-installing the plug-ins you are still having trouble locating the filters in the Avid then feel free to contact our support department for further assistance. You can reach them via email at email@example.com.