The following bugs are fixed:
- Behavior in some multi-store configurations fixed
- "Cannot add to cart" error for referrer, after a purchase with a discount had been made
- Discount usage limit for values over 1 worked incorrectly
- Complex combined discount rules (percent + fixed amount) were displayed wrong under some circumstances on the checkout
We strongly recommend to upgrade.
Find more information about the extension on the Refer a Friend Magento page.