It’s not possible to use those attributes for [download-attachment], while this is intended for quick, inline attachment download link display. But you can easily achieve that with [download-attachments] shortcode, by entering an attachment ID, removing list styling, download attachments title and other things you don’t need.
How to Get Support
After you register and login to the site, you may post all plugin support questions in the Support Forum.
If you need to provide private info, please create a ticket and then reply to it using Set as private reply option.