Mcafee installer is not launching

Disregard below as it may not apply to this version os macOS

" The macOS operating system resides in a sealed and read-only volume that can’t be opened by users or third-party application "

To add

 McAfee, ?

Windows-like viruses that self-replicate and affect macOS don’t exist because of the underlying UNIX Foundation and permission limitations.

The macOS operating system resides in a sealed and read-only volume that can’t be opened by users or third-party applications.

This antivirus software only protects the developers’ bank accounts and creates problems for users in return.

Mac app security enhancements are sufficient to protect computers from malware.

Adware and malware can affect computers and are often downloaded from “shady” websites or developers who inject them into downloads.

Source: User tip from @Kurt Lang

What is malware? - Apple Community

Count yourself lucky. FWIW, McAfee apps require macOS 11.0 or later.

I have nothing extraneous to add.