Then you do not attempt to download it at all..
...you leave that top box entirely empty.....
...........You go to the bottom-Rt corner of your screen
.....click on "I'll type it in myself" button.
and then proceed to enter it manually using your paper copy of the 1099-R.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*