The original serial number authorized version of this plug-in should still be located in: Macintosh HD > Obsoleted Digidesign Software folder > DAE Folder > Plugins folder. Move this copy of the plug-in back into the main plug-ins folder: Macintosh HD > System Folder > DAE Folder > Plug-Ins folder.Alternately, you can choose to reinstall this plug-in from the HD|Pack Installer, but you must first remove the newer version from the Plug-Ins folder, otherwise you will end up with duplicate versions of this plug-in (and Pro Tools will still load the floppy authorized versions only).