Thank you very much for reply.
I’ll try to customize your sample function to get custom link and custom image
getting info by $r->id post id into _postmeta table.
Hope you will be able to implement attachment index feature with wp-download-manager plugin,
1st becouse that plugin is most used download plugin and 2nd they don’t have plan to develope attachment index feature, so you can be linked by them to use your plugin for search.