Hi,
The plugin is always accessible to download to all of our customers under their codecanyon.net downloads section.
If you purchased the plugin before, then you must have an account on codecanyon.net, because that is the only place to buy the plugin legitimately. They have a lost username/password form too, in case you forgot your details. You can donwload the plugin there anytime, even if you don’t have an active support extension.
If your old purchase code did not work, then it is very likely that the support period was over for that purchase. It is either 6 or 12 months, depending on the original purchase.