Hello,
You have to use [audio_player] template tag in page template to show audio player.
As you are using free version you can’t edit templates tag directly.
In the free
You just need to follow this:
1. Copy page-templates directory from /plugins/download-manager/src/package/views directory to your active theme directory.
2. Make a new directory as download-manager in your active theme directory.
3. Now remove all files from {active-theme}/download-manager/page-templates except the template files you need to update.
4. Update template file(s) in {active-theme}/download-manager/page-templates directory as per your need.
Thanks