newsupernova/vendor/magento/module-downloadable/etc/frontend/events.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_type_multishipping_create_orders_single">
        <observer name="checkout_type_multishipping_create_orders_single" instance="Magento\Downloadable\Observer\SetHasDownloadableProductsObserver"  />
    </event>
    <event name="checkout_allow_guest">
        <observer name="checkout_allow_guest" instance="Magento\Downloadable\Observer\IsAllowedGuestCheckoutObserver" />
    </event>
    <event name="product_option_renderer_init">
        <observer name="downloadable_observer" instance="Magento\Downloadable\Observer\InitOptionRendererObserver" />
    </event>
</config>