Anonymous user's can't views/download files uploaded via file field
Figured out! I have uploaded a .rar file, so drupal wouldn't recognize this as existed file types e.g. audio, image, document. I had to go in admin/structure/file-types/manage/document

And add mimetypes for .rar and .zip extension:

application/rar
application/zip


Then just reuploaded file and gave anonymous user's permission:

Document: Download any files