You can check the version of your WHMCS live chat add-on by opening any PHP files within the /modules/livehelp folder in a text editor application. You may need to use an FTP or SFTP application to open one of these files from your web site. The live chat version is shown within a comment at the top of every encoded PHP file like the following example. For this example you can see the live chat add-on version is v4.1 rev 3.
// *************************************************************************
// * *
// * WHMCS - Live Chat & Visitor Tracking Addon *
// * Copyright (c) WHMCS Ltd. All Rights Reserved, *
// * Version: 4.1 rev 3 *
// * Build Date: 25 Aug 2014 *
// * *
// *************************************************************************
// *************************************************************************
// * *
// * Email: [email protected] *
// * Website: http://www.whmcs.com *
// * *
// *************************************************************************
// * *
// * This software is furnished under a license and may be used and copied *
// * only in accordance with the terms of such license and with the *
// * inclusion of the above copyright notice. This software or any other *