Have you checked the license.dat file to see if it gets deleted each time? If you have a valid license.dat file, you shouldn't need to activate again even if its not online.
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.