Unable to update license key

Rinaldo, You've actually posted your query in the wrong area! It should have been located here (https://support.avg.com/answers#!/feedtype=RECENT&dc=Windows&criteria=ALLQUESTIONS).
AVG Guru

Rinaldo, You've actually posted your query in the wrong area! It should have been located here (https://support.avg.com/answers#!/feedtype=RECENT&dc=Windows&criteria=ALLQUESTIONS).
AVG Guru

I could not update my client AVG internet security business edition 2013 for new license key. The license key field is greyed out.

How do I update it without uninstalling and reinstalling it?