XF 1.5 Finding addons

Is there any way to find addons I've already downloaded? I've just reinstalled XF and I'm looking for some addons I used to have, one I'm looking for shows new posts above the forums
Thanks, the only one I have there is XenPorta 2 (Portal) PRO, another questions, I'm sure I bought this a while back but can't seem to download it, do I have to contact the developer?