I've installed "Super Speedy Sale Page for WooCommerce" and done the initial setup. However I can't find the "replacement drop-in shortcode for WooCommerce products on sale" or the "dedicated page for products you have on sale"?
Visit your WooCommerce settings page then click the Products tab. On this page you’ll find a dropdown to choose the On Sale page.
It’s this URL: /wp-admin/admin.php?page=wc-settings&tab=products
Note: The Faster Woo Widgets plugin does this in a different way that works a lot better. Inside Faster Woo Widgets, in Settings, you can choose the permalink there along with all of your SEO indexing options amongst other cool configuration options.