There Is No Quickview Button

You may find after installing that no quickview button is visible. QuickTray uses WooCommerce hooks to place the button, and some themes remove these hooks.

1. Firstly, try a default theme like Storefront to see if your theme is at fault.
2. If it is your theme, have a look for the file named woocommerce/content-product.php. This file should contain a hook just before the closing </li> tag: do_action( 'woocommerce_after_shop_loop_item' );. If it’s not there, create a child theme and add it in.
3. You could also try changing which hook the button is displayed on.