No, you don't need a key disk, you need to install the correct version of D-Verb, which uses your D-Verb serial number/authorization code. Installing Pro Tools LE 5.1 or the D-Verb Plug-In Demo over previous installs of Pro Tools LE will remove your FREE D-Verb Plug-In. To keep your FREE D-Verb Plug-in from being overwritten by the Pro Tools LE 5.1 and D-Verb Demo Installers, remove both the D-Verb and D-Verb AS Plug-Ins from your Plug-Ins folder. Place the plug-ins in a temporary location other than the Pro Tools Plug-Ins folder and outside of your System Folder, such as on your Desktop. The Plug-Ins folder is located in the following directory:System Folder:DAE Folder:Plug-InsAfter removing the D-Verb & D-Verb AS Plug-Ins from the Plug-Ins folder,run the Pro Tools 5.1 LE Installer. Once the Pro Tools 5.1 installation is complete, both the D-Verb and D-Verb AS Plug-Ins can be returned to the Plug-Ins folder. An updated FREE D-Verb Installer for Pro Tools LE users is posted on the Digidesign website in Support/Downloads at: www.digidesign.com If you have already run either the Pro Tools LE 5.1 or D-Verb Demo Installer and fear you have overwritten your FREE D-Verb Plug-Ins,you can still reinstall the FREE D-Verb Plug-In Promotion from the Pro Tools LE 5.0.1 Software CD.The D-Verb serial number for newly purchased systems is located on the "FREE D-Verb for Pro Tools LE" promotion brightly colored postcard that is included with the system. If you upgraded to Pro Tools LE 5.1 the authorization from D-Verb 1.7 will still be valid for D-Verb 1.8.