Launch Astah, go to [Help] – [License]. Click [Set License key] and specify the license file.
Enter your name or machine# that can identify you and click [Activate]. (You need the Internet connection at this step.) This name will be used in the license control view which license manager uses to view the current users.
A confirmation message opens when it completes. Click [OK] and start using Astah. Now you can use Astah without Internet Connection.