Rafael Dominguez

ok, thank you very much.

Thank you Shahriar.
It looks ok right now, ¿could you point me what was the problem?

Hi the pluging is up to date: Download Manager Pro v4.7.4

but still warning in back end.

¿any idea?

WP 4.9.4 – Download Manager 4.7.3. (pro)
In front end -category widget:
Notice: Trying to get property of non-object in …home/html/landing/wp-content/plugins/download-manager/widgets/class.Categories.php on line 77