Sagepay Version issue

I had a notification from SagePay that version 2 of the SagePay form protocol is being discontinued on July 31st 2015.

Here you can find the step to Upgrading from 2.23 to 3.00.
URL : https://www.sagepay.co.uk/support/12/36/upgrading-from-2-23-to-3-00-a-brief-overview

I have found in plugin code that VPSProtocol is already 3.00.
But as per sagepay documentation need to change encryption method.

I just wanted to know that we need to change the code(encryption method) or not?
This plugin will work or not with WP version 4.2.2 without any changes in plugin code?

Thanks,
Nagender

https://ww.wp.xz.cn/plugins/sagepay-server-gateway-for-woocommerce/