Thanks for the reply.
My video is hosted remotely, and I have pasted the video’s embed code into the content area on the package details page, and it works just fine.
The link template shows a button called “Download”. I have cloned the template as you suggested and assigned the new template to the package page using the “Link Template” drop down menu. However, changing the drop down menu for the link template doesn’t seem to affect the actual link template. You mentioned “Use the new link template with your shortcode”, but I don’t know where to enter shortcode on the package details page.
Can you tell me what else I should try?