Advanced Custom Fields Plugin will enable you to use unlimited custom fields and field groups with WordPress Download Manager. You can create different custom field groups a per your package needs. This Add-on will be helpful for you if you want to show additional package information in a formatted way. Also, you can use this add-on to extend email lock feature, when need to capture additional data from site visitors.
Download WP Download Manager Advanced Custom Fields 1.9.4 at WP Liga for Free with an active Membership. You will receive the exact same .zip file distributed by the original author, secure and 100% virus free.