Hi Kim,
Unfortunately, I am fairly certain that E-Junkie can not handle variants for digital products. At least it couldn't several months ago when I was developing a website that could have really used this feature.
I created a work-around by using radio-style buttons to give the customer a choice of which format they want the specific digital product (including in my case, an option to buy it on CD). Then, by using a javascript function to reference the customer's choice, when the add to cart button is clicked, the correct product is added to the cart.
You can see an example of this integration by visiting one of the pages that uses it:
http://www.pediasleep.com/sounds/whitenoise_babies.html
If you would like help setting this style of integration up on your own site, please just drop me an email or give me a call using the contact information on my website. It would be very easy to modify the code so that it would give your customers a choice between two versions of your downloads.
I hope this helps.
Take care,
Andrew
Easy E-Junkie
htttp://www.EasyE-Junkie.com