Does it matter if I have Magento Community?
SagePay functionality is a part of Pro version of One Page Checkout. SagePay will work for Magento Community if modifications are made, which we will do for free. But, you would need to buy Pro version of One Page Checkout. Free version of One Page Checkout does not support SagePay by default.
Where can I purchase the Pro version?
Please click here to be directed to the One Page Checkout extension. From there, proceed to checkout and be sure to add the Pro version of the extension to your cart.