first commit

wp-content/plugins/duplicator-pro/installer/dup-installer/templates/base/pages-parts/step1/actions/switch-template.php

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+<?php
+
+/**
+ *
+ * @package templates/default
+ */
+
+defined('ABSPATH') || defined('DUPXABSPATH') || exit;
+?>
+<div id="installer-switch-wrapper">
+    <span class="btn-group small">
+        <button 
+            type="button" 
+            id="s1-switch-template-btn-basic" 
+            class="s1-switch-template-btn active" 
+            title="Enable basic installer mode"
+        >
+            Basic
+        </button>
+        <button 
+            type="button" 
+            id="s1-switch-template-btn-advanced" 
+            class="s1-switch-template-btn" 
+            data-template="<?php echo DUPX_Template::TEMPLATE_ADVANCED; ?>" 
+            title="Enable advanced installer mode"
+        >
+            Advanced
+        </button>
+    </span>
+</div>

wp-content/plugins/duplicator-pro/installer/dup-installer/templates/base/pages-parts/step1/continue-block.php

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+<?php
+
+/**
+ *
+ * @package templates/default
+ */
+
+defined('ABSPATH') || defined('DUPXABSPATH') || exit;
+
+use Duplicator\Installer\Core\Params\PrmMng;
+
+?>
+<div id="next_action" class="bottom-step-action no-display" >           
+    <div class="footer-buttons">
+        <div class="content-left">
+            <?php
+            dupxTplRender('pages-parts/step1/terms-and-conditions');
+            PrmMng::getInstance()->getHtmlFormParam(PrmMng::PARAM_ACCEPT_TERM_COND);
+            ?>
+        </div>
+        <div class="content-right" >
+            <button 
+                id="s1-deploy-btn" 
+                type="button" 
+                title="<?php echo DUPX_U::esc_attr('To enable this button the checkbox above under the "Terms & Notices" must be checked.'); ?>" 
+                class="default-btn">
+                Next <i class="fa fa-caret-right"></i>
+            </button>
+        </div>
+    </div>
+</div>

wp-content/plugins/duplicator-pro/installer/dup-installer/templates/base/pages-parts/step1/options.php

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+<?php
+
+/**
+ *
+ * @package templates/default
+ */
+
+defined('ABSPATH') || defined('DUPXABSPATH') || exit;

wp-content/plugins/duplicator-pro/installer/dup-installer/templates/base/pages-parts/step1/step-title.php

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+<?php
+
+/**
+ *
+ * @package templates/default
+ */
+
+defined('ABSPATH') || defined('DUPXABSPATH') || exit;
+
+dupxTplRender('pages-parts/head/header-main', [
+    'htmlTitle'       => 'Step <span class="step">1</span> of 2: Deployment ' .
+        '<div class="sub-header">This step will extract the archive file, install & update the database.</div>',
+    'showSwitchView'  => true,
+    'showHeaderLinks' => false,
+]);

wp-content/plugins/duplicator-pro/installer/dup-installer/templates/base/pages-parts/step4/step-title.php

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+<?php
+
+/**
+ *
+ * @package templates/default
+ */
+
+defined('ABSPATH') || defined('DUPXABSPATH') || exit;
+
+dupxTplRender('pages-parts/head/header-main', ['htmlTitle' => 'Step <span class="step">2</span> of 2: Test Site']);

wp-content/plugins/duplicator-pro/installer/dup-installer/templates/base/scripts/step1-deploy.php

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+<?php
+
+/**
+ *
+ * @package templates/default
+ */
+
+defined('ABSPATH') || defined('DUPXABSPATH') || exit;
+
+use Duplicator\Installer\Core\Security;
+use Duplicator\Installer\Core\Params\PrmMng;
+use Duplicator\Installer\Utils\SecureCsrf;
+use Duplicator\Libs\Snap\SnapJson;
+
+$nextStepPrams = [
+    PrmMng::PARAM_CTRL_ACTION => 'ctrl-step4',
+    Security::CTRL_TOKEN      => SecureCsrf::generate('ctrl-step4'),
+];
+?>
+<script>
+    DUPX.deployStep1 = function () {
+        DUPX.oneStepDeploy($('#s1-input-form'), <?php echo SnapJson::jsonEncode($nextStepPrams); ?>);
+    };
+</script>