Procedure

1. When you open TMXEditor from the official installers for the first time, or when the subscription key is not registered, the following dialog is displayed:
   
2. If you have a subscription key, type it in the Subscription Key text box and click the Register Subscription button.
   On registration success, the main editing screen will be presented.
3. If you don't have a subscription key and wish to test the program during 7 days, click the Request Evaluation Key button.
   The following dialog appears:

   
4. Enter the requested data and click the Request Evaluation Key button.
   On success, an email with the requested evaluation key will be sent to the indicated address and the following dialog will be displayed:

   

   Check your email and register the evaluation key using the instructions shown above.