To add a key file:
The Add a key window opens.
The file selection window opens.
Once added, a key can have active or additional status. The first key to be added automatically becomes active. You can use the program as soon as you add an active key.
After adding an active key, you can add an additional key. The additional key automatically becomes active upon expiration of the active key.
You can now activate the program with an activation code. You are advised to activate the program using a key file.