I've installed the plugin and configured the required settings and transaction go through fine, the emails are sent out to the customer as expected with the download link listed at the bottom of the email.
However, when clicking the link or when returning to the receipt page from PayPal (Standard) the page simply displays 'Receipt Not Available'.
Also, when using the URL provided by the email receipt is used, the link is stripped of the ?duid=(code).
So, while the transactions are working fine, there is no way of allowing the customer to download their purchase.
Also, the cart is not being emptied upon return to the site after successful purchase.
The site uses WP-Better Security which can cause issues with other plug-ins, but I've removed the settings that normally block longer URLs and still no joy.
So, not sure if there is a conflict there or whether something else is causing the issue, but some help would be greatly appreciated to get this working.