Without a legitimate license, your virus definition database will not update. This means you are technically "protected" by a program that does not know about the last 30 days of new malware. This is worse than having no antivirus at all, as it creates a false sense of security.
This guide covers everything you need to know about obtaining, using, and staying safe while looking for trial keys. 1. How to Get a Genuine ESET Trial Key eset 30 day trial key
If you decide to buy, look for "Multi-Device" bundles. They are often significantly cheaper per device than buying individual licenses for your PC, laptop, and phone. specific differences between ESET's various home security tiers? Without a legitimate license, your virus definition database
Here are your four safe options:
The official 30-day trial is free and safe. Why risk your identity for a few extra weeks? This guide covers everything you need to know