I had the same problem as you using the link from that thread. Here is a link to download it from. I was so frustrated trying to figure it out, but once I downloaded this everything went smoothly.
http://www.techerrata.com/dl.php?path=14&file=Sideload_update_1-1.zip
You will have to change the file name and get rid of the "_1-1" at the end of Sideload_update before putting it onto your Nook Color otherwise it won't work.