You wouldn’t buy a car without a test drive. The same logic applies to security software.
If you have lost a previously activated trial or subscription key, you can use the ESET Lost License page to have it resent to your registered email. Product activation | ESET Internet Security Eset Internet Security Trial Key
ESET Internet Security is a proprietary antivirus and firewall suite. Legitimate trial keys are provided by ESET to allow potential customers to evaluate the full version of the software for a limited period (typically ). The trial key unlocks all premium features without initial payment. You wouldn’t buy a car without a test drive