My Avast Pro antivirus subscription is nearly due, the official Avast site quote £19.99 ,but on Antivirussales.com where i originally signed up to Avast it is £15.99 , how come such a price differance for the same product ,or am i missing something ?
Not unusual.
Unless you’re on auto renewal, purchase it from where you get the best price as long as it’s the same product. 
Thanks for the reply…at the moment i have Avast Pro on the pc that i paid for ( runs out soon) , if i wanted to upgrade to say Avast Internet Security ,would i need to uninstall Avast Pro , or do i just put in the activation code that would come with the purchase and let the computer do the rest ?
Sorry if it is obvious what to do ,but am not that pc savvy as yet !!!
Just insert the license and avast will do the updating/upgrading for you.
Many thanks for that…