The offer on the download page is opt-in by default and you need to uncheck the check-box to deselect it. If you have an ad-blocker extension or add-on installed, it may be blocking the offer panel. To avoid this in the future, please disable any ad-blocker you may have, or use the off-line installers from the links Mike has provided.
I believe the O.P. is referring to an "update" via the Flash Player GUI which installs McAfee Security Scan with NO opt out.
I've personally seen and documented this with screen caps. Pat Willener submitted it several months ago.
I'm all for pointing people to the offline installers which have nothing bundled, but I hate unwanted installs as much as the other users who complain here. There is an update URL which downloads and installs McAfee with no end user knowledge or chance to say "no" and that really should be changed.