First double check that the plug-in is in the Plug-in managers scan path. The scan path is in
Edit > Preferences > File > VST Settings "VST Scan Folder(s)". Of course, when the "Configure as synth" box checked, the plugin moved from the Audio plug-ins category to the Synth plug-ins category. This has caused some to lose where the plug-in is found in the media browser and plug-in menus.
Bitbridge is the 32bit to 64bit wrapper which is part of the SONAR package. All 32bit VSTs run in a BitBridge server when running 64bit SONAR. Aside from memory management and setting the server a plug-in runs in, there is not much user control over Bitbridge. The only tweaks that I know of would not seem to be appropriate here. But here they are anyway, in the Bitbridge.exe compatibility tab, set the compatibility mode to "Windows XP (Service Pack 3)" and check "Run the program as administrator". The Bitbridge.exe is located in "C:\Program Files\Cakewalk\Shared Utilities".
JBridge is a thrid party 32bit to 64bit wrapper. I do not own it and have no experience with it. Some have reported good results with it where BitBridge failed to work properly.
As I indicated in my first post. The least cost solution would be to see if 32bit SONAR works with the plug-in.