You do not need to do any settings in your PayPal for this to work. eStore is designed to work with the default PayPal settings.. however if you have changed the settings around how the IPN and auto return is handled then I need to know cause a wrong settings will make it to know work.
For example, you have “Auto return” turned on in your PayPal profile the “Thank You” page won’t display the downloads cause when you use “auto return” PayPal doesn’t POST the payment data back to the site and without verifying the payment data the plugin wont’ give out the downloads.