Like a lot of these 64 bit installers EZdrummer doesn't see the C:\Program Files\Cakewalk\Vstplugins folder and so will create it's own folder and install the 64bit dll file there instead. Usually something like C:\Program Files\Vstplugins\whatever.
It's quite ok to simply move the dll file to the cakewalk vst folder and rescan. Alternately you can point cakewalks vst path to C:\Program Files\Vstplugins but I prefer the first method.
Steve