The question being is your (Trial) subscription the same McAfee Version you just purchased/or renewed?
This may be the case where you should contact Customer Service/Technical Support. If it was simply renewed, it should kick in after the expiry date.
The following Link is how to contact McAfee 24/7 ( Free ) :McAfee Consumer Products - Types of Support
Via Phone/Chat is much quicker.
If you feel comfortable personally doing it, here is the Guides/Instructions to remove the existing (Trial) Version, in order to install your Version you purchased. You should have a (CS) Customer Service Confirmation/Receipt number also.
All the very best,
McAfee Volunteer Moderator