Hello Bar plugin

Hi, I’m trying to upload a new plugin called Hello Bar. Unfortunately, I keep getting error messages like this: Installing Plugin from uploaded file: hellobar_wp_plugin.php
Unpacking the package…

The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature
Here is a view of the plugin:<?php

/*
Plugin Name: Hello Bar (Official)
Plugin URI: https://www.hellobar.com
Description: Inserts your custom Hello Bar on thriftynseattle.com. Because of the WordPress User Bar, you might need to log out and visit your WordPress site again to see your Hello Bar. Please note that this plugin is only valid for thriftynseattle.com. If you want to edit your Hello Bar click “Visit plugin site” below.
Version: 1.0
Author: Hello Bar
Author URI: https://www.hellobar.com
License: GPL v2

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2, as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

*/
function add_hellobar_script()
{
echo “<script src=\”//my.hellobar.com/ef7f08da37a2250aaad658d94fb65d58a0a6fc72.js\” type=\”text/javascript\” async=\”async\”></script>”;
}

add_action( ‘wp_footer’, ‘add_hellobar_script’);

?>
I’m a brand new blogger and not very tech savvy so I would appreciate any help you can give me.
Thanks,
Heather