AVG Tune Up and AVG Internet Securit

I have recently bought a second computer. I have licence for 2 computers on AVG Tune Up and AVG Internet Security. On computer that I used to purchase licences installation is not a rroblem but I cannot seem to to  bdownload  on second computer. ForInteret Security I am told that product is already in my basket for Tune Up I am told tht I am entering thre wrong product key