When you access the MindGenius splash screen
(The one showing the days remaining on your evaluation), you have three choices, "Go Buy", "Activate" and "Trial".
The MindGenius Splash Screen
To evaluate the product, select "Trial".
Should you later decide to purchase the product, on receipt of payment you will receive a Product Licence Number and Product Security Code. At that stage, select "Activate" and register the evaluation as a licensed copy of the software.
(Once the trial period (14 days) has passed, MindGenius will enter a reduced functionality "Viewer" mode. This can be changed back to a live version either by purchasing a full licence or entering a trial extension code)