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I don't think I understand your question but,
If McAfee's trial has ran out, then you cannot update it.
(Don't hold me to it, I've never ran the trial.)
That is indeed a good question, please be informed that if the trial version and the one that you are subscribed to are the same version , you can very well go ahead and check for updates by which there happens an upgrade. But, if the one that is subscribed is a different package like Total protection / Internet security you will have to run the removal tool and reinstall the new version.
I would recommend you to get in touch with our technicians by clicking on the Useful Links at the top of this page , as they would let you know the type of subscription you are entitled to and would help you in getting the same installed to your machine.