Well, I was successful in setting up the sandbox, and everything worked. I got the email and the download link. However, the download link was wrong. I had to use the “generate encrypted link” feature in the plugin, replace the url in the product details, then it worked fine and I was able to download the product.
I don’t know why the first test did not send an email, but sometimes they do get stuck in cyber space for a while. I guess we’ll see if it ever comes through.
Where do I find the file that the debug feature generates?