UPDATE INSTRUCTION:
The following files has been changed in version 2.0

Modules

  1. PrinterModule.php
  2. assets/printer.js
  3. components/PrinterClass.php
  4. components/ReceiptClass.php
  5. contollers/AjaxController.php
  6. contollers/IndexController.php
  7. contollers/Merchant_panelController.php
  8. contollers/UpdateController.php
  9. contollers/header.php