have you looked in your plug in manager to make sure sonar is scanning the right folder?
go to preferences(by hitting the P on your keyboard.
go to vst settings,in the top window "vst scan folder(s)
you sould see this line c/program files/cakewalk/vst plugins.
and also this line.
***you may also have failed to do this
when you ran the update,did you run the 32 bit update and the 64 bit update?
you need to run both.
to make things easier,read the document that came with ez drummer update.
heres an insert from that doc.
"If your computer is running a version of Windows made for 64 bit processors and you intend to use EZdrummer in a 64 bit host, double click the
EZdrummer 32 bit Updater included in this archive and follow the on-screen instructions. Once the process has been completed, double click the
EZdrummer 64 bit Updater included herein and follow the on-screen instructions."