Custom Button Images

In order to use your own images for EDD buttons, navigate to Downloads > Settings > Styles and change Default Button Styles to Plain Text.

You can then use CSS to style.

Here's an example which allows you to change the image for the "Purchase" button:

.edd-submit.plain {
    background: url(PATH_TO_IMAGE) !important;
    padding: 6px 8px !important;
}

Adjust the CSS as you need to.

To change individual buttons, you can prefix the CSS with "#edd_purchase_DOWNLOAD_ID"