Thanks for contacting us here about this extension. You should be able to download your product from the "My account" menu: https://www.joomunited.com/my-account From this page, scroll down and you’ll have access to the downloadable files.
We're really sorry for that, I just check and it seems you had a WP File Download membership that has been created but not validated due to a Paypal invalid IPN error. The transaction finally was validated after few hours.
I've manually activated your account, the download should be in your account now.