In the new version i was able to get redirected to the checkout page via the pay pal when the total was 0.00 after promotion applied.
I then filled out the information in the checkout page and submit. I get a message saying the cart is empty however there is an image present in the cart.
I went back to the cart removed the image and then re added the digital download to cart and tried again. The second time it worked. It seems like sometimes it is not seeing the item in the cart.