The description says:
allows the user to set a product as digital product and use the attachments to sell files. The download link is added on the My Orders page when the payment is confirmed
Therefore the link is available on the customer portal.
It is available in "My orders" but not when you go through the portal.
I did the following:
- send invoice using template "Invoice - Send by Email (Portal)" so that the customer can create an account using the link in the e-mail
- when the customer arrives in the portal, he first has to go to "website" (link on top left of screen)
- select his username on the rop right and click "my account"
- click on sales order id
Now you will see the product with a "Downloads" dropdown next to it. Click it and select the file to download.
Download will start automatically.
The download file will get the name of the title in your digital attachement, so if you want it to be available with the correct extension, you have to add it in the title.