Employ Conditional Script Loading

conditional-script.php

<?php 

function load_scripts_based_on_browser() {
    global $is_IE;
    if (!$is_IE) {
        // Modern browsers
        wp_enqueue_script('modern-js', 'path_to_modern_script.js', array(), null, true);
    } else {
        // Legacy browsers
        wp_enqueue_script('legacy-js', 'path_to_legacy_script.js', array(), null, true);
    }
}
add_action('wp_enqueue_scripts', 'load_scripts_based_on_browser');