Due to Sage Pay releasing version 3 of their payment gateway protocol, they will be discontinuing support for earlier versions beginning July 31st, 2015. If you are using Sage Pay, this means your store will be unable to process payments without this upgrade. Read the full release from Sage Pay here.
Qualiteam has released a fix that “will likely work for 4.6.x, 4.5.2, 4.5.3, 4.5.4, and 4.5.5. It may work for earlier versions, but we didn’t test it.”
We wanted to notify our customers as to the change, so it does not catch anyone using Sage Pay off guard. As always, if you have any questions or support needs based around this change, please contact us.