For older versions or specific corporate deployments, registration might involve replacing a .lic file in the installation directory, though the "License Code" method is standard for modern versions.
For businesses, using unlicensed software is a major liability during audits. How to Get an Official Exclusive License
After buying a license from EMCO Software, the code is sent via email.
When you need to monitor more than 5 hosts, EMCO offers paid licenses:
EMCO Ping Monitor license keys are issued as a License Code after purchase to unlock advanced host monitoring and administrative features
EMCO Ping Monitor License Key Exclusive: The Complete Guide to Professional Network Monitoring