All McAfee trial installers fail to start because McAfee's signing certificate has expired
Every single McAfee trial installer is currently failing to start because the digital signing certificate that is used to sign vi2.dll expired on 7/21, and the installer doesn't consider that the signature was timestamped.
A temporary workaround is to set your clock back before 7/21, e.g. to 7/18.
That's a pretty embarrassing problem to have for a security company.