Can I make multiple choices for Download Products??

I'm using the most current version of Zencart for my site.

All of my products are sold as downloadable products.

There's options of different sizes to choose from and various different formats. All of my product are uploaded in zipped files.

Rather than make a new product for the same design that is in a different size, I would like to create a couple of attributes for the customer to choose from. The price remains the same, but the customer has the option of what size they would like.

I tried to make this work without any success. Can anybody give me advice on how I can do this?

I have the Zencart manual and it is not making sense to me.

Thanks in advance.

See if this helps
https://www.zen-cart.com/tutorials/index.php?article=57