https://download.eset.com/com/eset/apps/business/era/agent/latest/era_agent_win64.msi (That is the agent installer – you still need a trial license key from ESET's website to activate it.)

It seems you're looking for the full, official download for the of ESET PROTECT Entry .

(formerly ESET Endpoint Protection Standard) is a paid subscription. There is no permanent "free" version of the full PROTECT Entry package.