You are curious that who downloaded your attachment? Is there anybody you know who loves it? This add-on will give this answer for you.
This add-on will show all members who viewed/downloaded an attachment.You can choose which group/s you would like to show the attachments viewers/downloders user list.
After you install the add-on, go to User Group Permissions, choose the groups that you would like to show the attachments viewers/downloders user list and all the way to the bottom you will see a new settings called: Attachment Views. Set Can view who downloaded attachments: to Yes and save the changes.
Then when viewing an attachment, just below the view count you will see a link that says: Attachment Viewers. Click it and a new pop up page will open containing all users that viewed/downloaded that attachment.
The attachment viewers/downloaders will be counted from the moment that the add-on is installed.