Moved to Consumer > General
No you wont be charged again.
Go to your online account page and download/install from there: Antivirus Software and Internet Security For Your PC or Mac | McAfee
If, and I doubt it would happen but you never know, it says your license has been used, phone for free Customer Service and they will release it for you.
If you have any technical issue then Technical Support is also free by phone. Both in the following link:
Is it OK now?