When you downloaded the file, did it appear "properly" or was it all scrunched up on one line?
Windows' built-in Notepad has an issue with displaying the readme.txt files, and if that's the case then there will have been an extra 3 at the end of the BF key. This is actually the index for step 3, and not a part of the key.
If there is a 3 at the end of your key, please try removing it and see if that works