Thanks for your response. Yes, I have the latest version. The Purchase receipt was not empty; it contained {download_list} which only resulted in that “sample download file name”.
In my Downloads, I have a few items. I see they all have same category and tag. I don’t know what I have to do to identify which of the downloads is to be included in the Purchase receipt. I can’t find that documentation. I would be happy to pay someone to help me with this, but for some reason I thought it would be faster to figure it out myself.