Adding buttons to pages that skip the cart

I want to be able to add button for a “Sign up” for a subscription product or a “Buy now” for a downloadable product to an existing WP page using my site’s button style. I can see the add_to_cart shortcode but there doesn’t seem to be a buy now shortcode that goes straight to the cart or checkout screen. I’ve tried using the Woocommerce Quick Buy plugin but it gave me a fatal error on my site so there must be a theme clash somewhere (I’m using Genesis+Maker Pro). Any easy solves to add a simple button?