If you are convinced of the necessity of a legitimate subscription—which any prudent computer user should be—here are the official and trustworthy sources:

: Have your 20-character activation key (formatted as XXXX-XXXX-XXXX-XXXX-XXXX) ready. 2. Downloading the Installer

Cite ESET’s official licensing policy, cybersecurity best practices, and any analysis of key-sharing sites.