I've successfully installed this side box with some editing..i'm using zencart 1.5 + crafty syntex 3.1.11 + this old sidebox..

To those who are still looking to install this plugin please follow below for some editing..

just follow the instruction that came with the sidebox and carefully edit the step 4
4. Edit: "\includes\templates\template_default\sideboxes\tpl_craftysyntax_sidebox.php "
// This flag controls whether or not you pass the Zencart customer name to CSLH.
// By default the name will not be passed.
$cs_flag = "true"; // Will pass customer's name.
$cs_flag = ""; // Won't pass customer's name.

// Directory where Crafty Syntax Live Help is installed
$cs_dir = "http://www.yoursite.com/store/livehelp"; //full URL link to your livehelp installed directory

// Department that you will be monitoring. Generated code from CSLH gives you
// something like "department=1". Put that number here.
$cs_dept = "1"; //Make sure the department is correct

// Pingtimes as set in Crafty Syntax. Generated code from CSLH give you something
// like "pingtimes=15". Put that number here.
$cs_pingtimes = "15";
now.. this is where most of you get a blank box...

just scroll down near the bottom of "\includes\templates\template_default\sideboxes\tpl_craftysyntax_sidebox.php "

and look for this code:

// Build Link to Crafty Syntax here which includes the full customer name.
$cs_link = '/' . $cs_dir . '/' . 'livehelp_js.php?department=' . $cs_dept . '&pingtimes=' . $cs_pingtimes . '&username=' . $cs_full_name;
}else{
// Build Link to Crafty Syntax here - no customer name.
$cs_link = '/' . $cs_dir . '/' . 'livehelp_js.php?department=' . $cs_dept . '&pingtimes=' . $cs_pingtimes;
}
And just remove the / (remove twice, two different line)

and save, then upload.. allset.

let me know if this work for anyone else