UiPress requires a licence key to unlock pro features. When you install the plugin you will see only lite features are available.
After a purchase of uipress pro, you will be given your licence key and it will also be sent to your purchase email.
To unlock pro features go to settings > UiPress settings. Under the general tab you will see a blue box where you can enter your key and activate.
If your licence is valid you will receive a notification saying the plugin has been activated and you will now longer see the activation notice.