Getting my full version code back

I bought this app awhile ago on my old phone that I lost (fail for not enabling!) but now I cant find the email that had the access code for confirming the purchase…at least I think thats how it worked. Im pretty sure I remember the email I signed up with etc and it was an unbound purchase. How would I go about not having to pay for the full version again?

Its all free now. :wink:
http://www.avast.com/free-mobile-security#tab5