Can not get Audition CS6 to load third party VST plugins

[Double.n]

I'm attempting to get Audtion CS6 to load Antares Autotune plugins using the Audio Plug-in Manager.  I've added the VST Plug in folder and scanned for plugins.  I've ticked the rescan existing plugins but I'm not getting any plugins listed at all.  I've tried using Jbridge but I still get nothing.  

I've searched online but I haven't been able to find any solution that helps.  

Any suggestions would be greatly appreciated as I'm getting a little frustrated.  

Please help

[SteveG_AudioMasters_]

Is it a 64-bit plugin? If it is, it won't work in a 32-bit environment, whatever you do.