When using the extension manager to install, make sure that Dreamweaver is closed, the extension manager cant update Dreamweaver if it is open when installing the extensions.
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.