My recommendation:never delete the plug-in iZotope_Radius .. , otherwise a little disaster occurs!
Even if you can download the plug-in from the net and install it in different directories like c:\VSTPlugins,
c:\program files\Cakewalk\VsTPlugins ...etc.
you get the bullish answer at starting Sonar: iZotope ... is missing, reinstall Sonar..!"
I reinstalled Sonar (you have to do it completely, (no options what you want and what you don't want to install...
you can uninstall things later). Who had this "excellent" installing method in his mind???
I did it and now the result is: "iZotope plug-in is missing, reinstall Sonar!!"
Now I'll reinstall a complete backup of c: ...