He didn't tell his professor where he got the software. But the next week, when a first-year student in the lab asked, "Hey, do you know where I can find an older version of Packet Tracer?" — Leo smiled.

He slammed the laptop lid shut, then opened it. Desperation led him to type the unthinkable into Google:

At 5:30 AM, he saved his lab and closed the laptop. He looked at the GitHub tab still open. Then he clicked "Star."

No one complained about viruses.

"Let me show you something." Not every GitHub download is a trap. Sometimes, it's a torch passed from one tired student to the next. Just always check the checksums and trust the hermits.

Leo clicked the green "Code" button, then "Download ZIP." His antivirus stayed silent. He extracted the folder. Inside: a PacketTracer_800_amd64.deb , a checksums.txt , and a single README_FIRST.txt .

His finger hovered over Enter. Every instructor had warned him: Never. Don't do it. GitHub isn't Cisco. You'll get a forkbomb, a cryptominer, or worse—a project from 2014 that emulates a hamster on a wheel.