What I can offer instead is a about:

You do not need to rely on social media for a trial key. ESET provides a of their full-featured software directly through their official website. Try ESET Free: Antivirus & Advanced Cyber Security Trial

Never pay for a "lifetime key" sold on Facebook marketplace. These are either stolen volume licenses (which get banned) or completely fake.

Leo exhaled, feeling like a master hacker. But as he closed the browser, he noticed a new, unfamiliar icon in his system tray—a small, blinking eye he didn't recognize. He had found his key, but in the world of "free" security, he was starting to wonder if he’d just let the wolf through the front door to keep the foxes out.

Publicly shared license keys often originate from "key sharing" communities where users post credentials for various software versions. Deceptive Reliability