Superior Drummer 3 plugin path issues

I'm in the process of downloading Toontrack's Superior Drummer 3.   I downloaded the first couple of installments.   But my issue is that it's not showing up in Sonar.  I went to the SD3 Standalone to check the .dll plugin path - and I found it.  
But when I go to Preferences > VST settings and try to add that path, I can't find it.   Superior Drummer 3.dll is on my computer.  I can find it apart from Sonar.  But it's not showing up when I try to add the path in Sonar.
 
I would appreciate any help.
 
Thanks!
Greg
 
 

Thanks!
 
Greg