You can integrate tawk.to with Zen Cart in just a few simple steps.
1. Extract the zip file and copy the contents of the YOUR_ADMIN_FOLDER folder to <ZENCART_INSTALLATION>/<YOUR_ADMIN_FOLDER>.
2. Copy the contents of the includes/templates/YOUR_TEMPLATE to <ZENCART_INSTALLATION>/includes/templates/<YOUR_CURRENT_TEMPLATE>.
3. Copy the other contents of the includes folder to <ZENCART_INSTALLATION>/includes.
4. Go to the Admin dashboard. Under Tools, you should be able to select tawk.to widget in the drop-down menu.