The current version of Design Extender is 1.1.1, if you are using a previous version, make sure to uninstall it from the extension manager and install the newer one that is available from the download center.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.