If you want to change Package download link to image, or if you want to change default download label to something else you can use this hook.
Two arguments are passed to this hook.
To change download link text to an image or other text.
add_filter('wpdm_button_image','my_btn_image',10,2);
<?php
add_filter('wpdm_button_image','my_btn_image',10,2);
function my_btn_image($link_label,$package){
$link_label = "<img src='img/source' >";
return $link_label;
}
?>
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