Yes. Have the 64-bit version installed.
I notice that Addictive Drums and Keys aren't the only 32-bit plugins in the . So is Cakewalk Sound Center, Drop Zone, RXP and a bunch of others. Maybe it's a file-path issue? During the XLN download session, I was given an error statement initially, saying that the file paths for VST32 and VST64 were the same (these were set by XLN by default it seems, as I didn't do anything but click the Install button in the downloader.
I left the default path for VST32 c:\Program Files\Cakewalk\VstPlugins (that was set by XLN in the downloader)
I changed the VST64 installation path to c:\program files (x86)\cakewalk\VST plug ins
NOTE: the differences in space and capitalization in the file paths are exactly as they read. BUT, I can see in the Sonar plugin manager that the Addictive Drums file path is this: c:\program files\cakewalk\vstplugins\Addictive Drums 2.dll, which is confusing, as that is not what I set the installation file path to.
Same for the Addictive Keys plugin. In the plugin manager, it says the file path is this c:\program files\cakewalk\vstplugins\Addictive Keys.dll. Again, that's NOT the installation file path I set on the XLN installer.
Not sure what's going on. Maybe I should uninstall and reinstall?