Jude77,
 
Yes, Sonar is scanning the folder where the .dll is located.   I can see the plugin when Sonar scans for the VST, I just do not see the plugin name when I search the Sonar plugin Manager.  I looked under VST, VST3, DXi, or instruments. Everything listed in the plugins Manager I have looked under, and I don't say anything labeled as Kush or REDD except for my Waves REDD.17, REDD.37 and REDD.51 Plugins.  I opened those in Sonar to make sure none of them were the Kush REDD DI plugin and they were not.