Taxonomy Count

// adjust downloads taxonomy loop

function custom_download_tag_count( $query ) {

	if ( ( $query->is_tax( 'download_category' ) || $query->is_tax( 'download_tag' ) ) && ! is_admin() && $query->is_main_query() ) {

		// replace 15 with desired amount

		$query->set( 'posts_per_page', 15 );

	}

}

add_action( 'pre_get_posts', 'custom_download_tag_count' );