Merging two Avast IS accounts into one

My wifes home PC has a licence that expires soon on 28th July 2013 but my laptop has a separate account expiring in 2014. At the time I didnt know that you could have up to 3 devices for the one account. How do I merge the older PC account to the newer account on my laptop. Both use windows 8.

insert the 2014 license in the AIS that is about to end…

Thanks for the advice. What are the exact steps to do that.

http://www.avast.com/faq.php?q=insert+license#searchForm

avast FAQ. http://www.avast.com/faq.php