Unfortunately and please do not shoot the messenger but McAfee has stopped supporting this product. as you said it was EOL 2015 and Mcafee supported it a bit past that. usually one sets a password and secret questions. and follows
Possible that who you bought it from enrolled it that said if above no help you will need a replacement motherboard I hear.
Sorry have to pass this on I am not a McAfee employee just a user here helping out.
As you can see from the other post you tagged onto even Mcafee support says they cannot help.
Marking thread "Assumed Answered"