Download either Structure101 or Restructure101, if you haven't already.
You will receive an email with a license key attached. Save the key to your drive.
On startup of either product for the first time, you will be prompted to browse to the saved license key.
Go to the "Help/About" dialog where your machine id will be displayed.
If no valid license is available when you attempt to start either product, it will pop up a dialog with the machine id displayed.
For Structure101 Build on machines with only command line access, simply run any of the command line utilities. If no license key is present the command will output the machine id.
Send us the machine id and we will forward you on the purchased keys.
If you have any questions or problems, do not hesitate to contact us.