Avast antivirus free

Like a previous subscriber I received an email asking if I was still with AVG. I didn't recognise it and after more than a week found out that it is a genuine email.
i activated the link but still cannot update the virus definitions which have not been updated for several days. This is the case on both my android tablet and laptop.
Would be grateful for any advice.
Thank you.

Hi Dave.
Are you using Avast AntiVirus free or AVG AntiVirus free on your computer?