Since version 1.17.2 you can show a add to cart link directly in our WooCommerce PDF Catalog plugin. When you do not want to show this as a link, past the CSS code below into advanced settings > custom CSS:
.product-add-to-cart-container {
background: #000;
color: #fff;
padding: 5px;
width: 100px;
margin: 10px auto;
}
.product-add-to-cart {
color: #fff;
text-decoration: none;
}

