Downloadable products radio button, links do not appear

I have read through every post and watched the how-to video carefully about creating the attributes for downloadable products, but I'm still stuck: I don't see the attribute I've created listed below the product name when I add-it-to-cart, and I don't get links to download the files after a purchase is completed.

I have 20 software products that I have uploaded as .zip files and see the green dot in each product.

I only have one downloadable format (zip) for these products, so I created only one Option Name [Download] and one Option Value [Software] during setup. I made it a radio button and made sure to select 'Default Attribute to be Marked Selected: YES' in each product.

(I am using the Easy Single Download plugin, but have gone back through the other admin panels to check the results of the entries from the plugin and all look OK.)

I have verified the Authorize.net payment module is set to Processing. I have set the Attribute Setting 'Downloads Controller Order Status Value >= lower value 1' just to make sure the links aren't getting hung up there.

I have NO selected for the 'Product is Virtual' and 'Always Free Shipping' options on the Product pages.

Because we offer customers the option to purchase a shipped-CD of any download for an extra $9.95, I created two shipping options:

"Software Download" as the $0.00 shipping 'freeoptions' (sort order 1)
"Software Mailed on CD" as the $9.95 shipping 'flat' option (sort order 2 )

Anyone see something I've missed?

Is the shipping setup I've created conflicting with the download options?

Any help or ideas are greatly appreciated. Thanks!

Store page:
http://www.standardlegal.com/store/index.php?main_page=product_info&products_id=1

Well I figured out my own issue.

Because I knew I was only going to have one attribute (Software Download) and knew that attribute was always going to be required, I made a 'design decision' to remove the attribute display code from the Product Info Display page.

Bad idea. You can't do that.

The attribute must be displayed on the page between the form tags somehow someway, or it prevents the cart from working properly and delivering the download links.

As soon as I put the attribute display back on the product page (albeit at the bottom of the page out of the way so as to not clutter the design), everything worked perfectly...