Hi, We recently had to add the PDT function as PayPal stopped sending the information needed for the plugin to display the links on the Thank You Page. We try to update this information in as many places as we can but with the forum sometime a few posts get missed. 
The old system where you had to have Auto Redirect turned off has been replaced with the new PDT option. This requires you to have Auto Redirect turned on.
You can read more about the issue with enhanced PayPal checkout here:
The following page will explain how to setup and use the PDT option (How to Use the Instant Digital Delivery Feature):
http://www.tipsandtricks-hq.com/ecommerce/wp-estore-instant-digital-product-delivery-4