From the installer:

"What?s new in McAfee Security 1.1
McAfee Security 1.1 has an enhanced graphical user interface and
safeguards your Mac from viruses, Trojan horses, and other malware.
Please read the McAfee Security 1.1 User Guide for more information on
how to use the software and secure your Mac better.

System requirements
Hardware
Mac computer with an Intel processor.
1 GB RAM or higher.
Software
Mac OS X Snow Leopard (10.6 or later) or Mac OS X Leopard (10.5 or
later) operating system.
Minimum 300 MB of free disk space (500 MB recommended).

Known issues
For known issues, see the KnowledgeBase article in the following URL:
https://kc.mcafee.com/corporate/index?page=content&id=KB71757"

Compatibility
Architecture: x86 (Intel:Mac)

Mac OS X 10.5 or later

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