McAfee installation error can occur on a computer due to some reasons but this error is curable. So you can fix this issue by some troubleshooting steps or contact with McAfee customer support.

• Disable the firewall or any other blocking application from your computer.
• Restart your computer.
• Then check the install manager.

Also, you should get the assistance of an expert team and you will be advised, the best possible solution of this issue.