The secondary webassist installer will run automatically after you install the extension from the extension manager and open a web page in dreamweaver.
Just install the extension with extension manager, then open any web page and it should pop up.
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.