It looks like you are using that serial number on another site already. I see you have other serials to use. I've included one in the private area that should have an activation available.
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.