The Free Downloads Pro plugin is not working with multiple variations.
I tested on a single variation (License Period) and it works perfectly and shows download button.
But with two variations (License Period & No. of Users) it does not show the download button. Add to cart button is shown instead.
Image with two variations : https://ibb.co/8mL1Nnx
Image with single variation : https://ibb.co/sFdk711