I have installed notification plug in with trial key.
After registration with the provided key according to the computer code, there is no reminder on the registration. But after the laptop is reboot again, then there is registration reminder that the notification plug in cannot be triggered with changes of the register values.
You should check that the key file PlgNotification_Reg.xml is located inside your project in the C:\SCADA\Projects\YOUR_PROJECT\Instances\Default\ScadaWeb\config folder