Make sure to open a new page after installing. That should launch the secondary installer. Then restart dreamweaver before accessing the extension. I have confirmed there is nothing wrong with the installer in the latest version.
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.