After the web assist installer completes, make sure you are restarting Dreamweaver before you try to activate.
let the WebAssist installer go through the 3 steps, click the done button, then restart DW
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.