The short answer is . There is no official "HOIC.dmg" file. The original source code (written in Visual Basic 6) was published on SourceForge and GitHub exclusively for Windows.
This is the current standard for script kiddies and pen-testers. It supports 56 different attack methods. download-hoic-ddos-tool-mac
So, I need to approach this carefully. Maybe start by explaining what HOIC is, its purpose, and the legal issues involved. Then, mention that using such tools without authorization is illegal and unethical. If someone is trying to learn about DDoS for defensive purposes, they should pursue legal means like joining CTF events or using training labs with permission. The short answer is