Hello,
I am Daria, technical support manager for PrestaShop module Paypal and I'm glad to help you.
In your case, we would recommend you to update the Prestashop first. As the version that you use is quite old and may contain security fails within.
To update your Prestashop, please contact your developer for help or PS support team, so they can provide you with instructions.
Thank you for using PrestaShop Paypal module support.
Regards,
Daria - support 202 e-commerce