Certainly. using your ftp program or file manager in your control panel for your hosting, go to where you installed HCL,
now open the modules directory
then the osTicket directory
then the hcl directory.
You should see a file called config.php. Edit this file (you may have to download, edit, then upload. Just depends on your setup.)
At this point you need to change the
// This sets HCL to use the module or not.
$GLOBALS['conf']['modules']['osTicket']['active'] = true;
// This sets HCL to display the module in the main admin links.
$GLOBALS['conf']['modules']['osTicket']['display'] = true;
to both being false. This will disable osTicket (and save you a LOT of headaches.)