Add Easy Image Gallery just before the content (and after the featured image) on Shop Front single download pages. Paste into functions.php

gistfile1.php

<?php

function my_theme_easy_image_gallery() {

	// return if we're not on a single download page
	if ( ! is_singular( 'download' ) )
		return;

	// stop it appending to the end of the gallery automatically
	remove_filter( 'the_content', 'easy_image_gallery_append_to_content' );

	// output gallery
	if( function_exists( 'easy_image_gallery' ) ) {
	    echo easy_image_gallery();
	}
}
add_action( 'shopfront_single_before_content', 'my_theme_easy_image_gallery' );