If you close Dreamweaver, then open it again, it will try to validate the activation. If you plan to work offline, open Dreamweaver, then open the extesnion once to verify the serial. Do not close Dreamweaver, then go offline.
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.