Hi Hamza, you could force all free downloads to run in a new tab by using the following snippet. I recommend the Code Snippets plugin to create the snippet for the site.

add_action('wp_footer', 'custom_always_open_free_downloads_in_new_tab');
function custom_always_open_free_downloads_in_new_tab()
{
	ob_start(); ?>

	<script>
	(function($) {
		$(document).ready(function() {
			$('form.somdn-download-form').each(function() {
				$(this).attr('target', '_blank');
			});
		});
	})( jQuery );
	</script>

	<?php $content = ob_get_clean();

	echo $content;
}