The Virto License Manager adds timer jobs to the Central Admin Web Application, which notify your designated contact person about subscription status and updates. You can read about it here.
The Timer Job “Virto_Alerts_Customiser_Job” is responsible for sending notifications collected by the Virto Notifications & Alerts Web Part according to the configured settings.
This timer job must not be disabled; otherwise, the functionality of the Virto Notifications & Alerts Web Part will be lost.