Avoid "free" license keys found on unofficial websites or forums. These are often pirated and can be disabled by ESET at any time. Using them may also expose your device to malware hidden in the activation tools. [KB2388] My Activation Key is not working
Yes – ESET licenses are sold as 1, 3, 5, or 10 devices. Each device gets its own unique key, but they’re managed from one ESET Home account. Eset 16 License Key
ESET 16 is robust, lightweight, and worth its modest price. Between the official 30-day trial, student discounts, multi-year plans, and seasonal sales, there’s no reason to resort to illegal keys. Avoid "free" license keys found on unofficial websites