I have installed 13.10 on a new computer and want to tranfer my purchase (Braid) there.

I have read this page about how to do this.

However, when I log in to https://software-center.ubuntu.com/subscriptions, nothing appears. My guess is that when I purchased this game, I used an older email address than the one I am currently using.

Ideally I would like to be able to transfer this purchase to my current ubuntu one account. Or, if this is not possible, at least to have a chance to know with which account this purchase has been done so I can have a try to reinstall it somewhere else.

NB: In the Ubuntu Software Center on my older computer the game is still there and marked as "already purchased".

EDIT:

This is not an upgrade issue, as my old computer has not been upgraded to 13.10, and my newer computer is, well, new, 13.10 being its first OS. Note that I don't see my purchases on the software center web site on my old as well as my new computer, which makes sense.