magento-test/app/code/Magento/Downloadable/view/frontend/templates/checkout/success.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
?>
<?php if ($block->getOrderHasDownloadable()) : ?>
    <?= /* @noEscape */ __('Go to <a href="%1">My Downloadable Products</a>', $block->escapeUrl($block->getDownloadableProductsUrl())) ?>
<?php endif; ?>