Assign custom icon for an item

Hello and thanks for the great plugin! Everything works for me till now except one thing. I’m trying to assign my custom icon for an item and I see the changed icon in the widget area but not on the page where I’ve put all of the packages using jstable version of the shortcode. I’d like to think there is an easy way to solve this. Regardless of the outcome of this thank you for your time and effort you’ve put on this. The link to the page is this

https://wordpress.org/plugins/download-manager/