To fix the problem i had to change the path of icon:
This is default path that the download manager give to me and i can’t see icon on articles page.
//tv247.altervista.org/wp-content/plugins/download-manager/assets/file-type-icons/down2.png
If I modify the path like that:
download-manager/assets/file-type-icons/down2.png
With that changes I can see the icon on articles pages BUT i can’t see the icons in the menu: Downloads -> All files
why? Coul you fix this issue?