diff --git a/src/script.php b/src/script.php
index b379812..0a95e73 100644
--- a/src/script.php
+++ b/src/script.php
@@ -10,9 +10,10 @@
 /**
  * MokoCassiopeia install/update/uninstall script.
  *
- * On update: renames the template to MokoOnyx (dirs + database),
- * copies all style params, creates matching styles, copies user files,
- * and redirects the update server. No external downloads needed.
+ * On update: copies the template as MokoOnyx (new directory), updates the
+ * database to register MokoOnyx, migrates styles + params, and sets it as
+ * the default site template. The old MokoCassiopeia directory stays intact
+ * (Joomla's installer still needs it) — the user can uninstall it later.
  */
 
 defined('_JEXEC') or die;
@@ -33,7 +34,7 @@ class Tpl_MokocassiopeiaInstallerScript
 
     private const ONYX_UPDATES_URL = 'https://git.mokoconsulting.tech/MokoConsulting/MokoOnyx/raw/branch/main/updates.xml';
 
-    // ── Joomla lifecycle methods ───────────────────────────────────────
+    // ── Joomla lifecycle ───────────────────────────────────────────────
 
     public function preflight(string $type, InstallerAdapter $parent): bool
     {
@@ -84,100 +85,165 @@ class Tpl_MokocassiopeiaInstallerScript
         return true;
     }
 
-    // ── Bridge: rename-in-place + DB migration ─────────────────────────
+    // ── Bridge ─────────────────────────────────────────────────────────
 
     private function bridge(): void
     {
         $app = Factory::getApplication();
 
-        // 1. Rename template directory
-        $templateRenamed = $this->renameDir(
-            JPATH_ROOT . '/templates/' . self::OLD_NAME,
-            JPATH_ROOT . '/templates/' . self::NEW_NAME,
-            'template'
-        );
-
-        if (!$templateRenamed && !is_dir(JPATH_ROOT . '/templates/' . self::NEW_NAME)) {
+        // 1. Copy template directory (don't rename — Joomla still needs the old one)
+        $copied = $this->copyTemplateDir();
+        if (!$copied && !is_dir(JPATH_ROOT . '/templates/' . self::NEW_NAME)) {
             $app->enqueueMessage(
-                'Could not rename template directory to MokoOnyx. '
-                . 'Please rename <code>templates/mokocassiopeia</code> to <code>templates/mokoonyx</code> manually.',
+                'MokoOnyx bridge: could not create template directory. '
+                . 'Please copy <code>templates/mokocassiopeia</code> to <code>templates/mokoonyx</code> manually.',
                 'warning'
             );
             return;
         }
 
-        // 2. Rename media directory
-        $this->renameDir(
-            JPATH_ROOT . '/media/templates/site/' . self::OLD_NAME,
-            JPATH_ROOT . '/media/templates/site/' . self::NEW_NAME,
-            'media'
-        );
+        // 2. Copy media directory
+        $this->copyMediaDir();
 
-        // 3. Update #__extensions
-        $this->updateExtensions();
+        // 3. Register MokoOnyx in #__extensions (if not already there)
+        $this->registerExtension();
 
-        // 4. Migrate template styles (create matching MokoOnyx styles with same params)
+        // 4. Migrate template styles (create MokoOnyx styles with same params)
         $this->migrateStyles();
 
-        // 5. Copy user files (custom themes, user.css, user.js)
-        $this->copyUserFiles();
-
-        // 6. Redirect update server to MokoOnyx
+        // 5. Redirect update server to MokoOnyx
         $this->updateUpdateServer();
 
-        // 7. Notify
+        // 6. Notify
         $app->enqueueMessage(
-            '<strong>MokoCassiopeia has been renamed to MokoOnyx.</strong><br>'
-            . 'All template settings, styles, and custom files have been migrated. '
-            . 'MokoOnyx is now your active site template.',
+            '<strong>MokoOnyx has been installed as a replacement for MokoCassiopeia.</strong><br>'
+            . 'Your template settings have been migrated. MokoOnyx is now your active site template.<br>'
+            . 'You can safely uninstall MokoCassiopeia from Extensions &rarr; Manage.',
             'success'
         );
 
         $this->log('=== Bridge completed ===');
     }
 
-    // ── Bridge helpers ─────────────────────────────────────────────────
+    // ── Copy directories ───────────────────────────────────────────────
 
-    private function renameDir(string $old, string $new, string $label): bool
+    private function copyTemplateDir(): bool
     {
-        if (!is_dir($old)) {
-            $this->log("Bridge: {$label} dir not found ({$old}) — skipping.");
+        $src = JPATH_ROOT . '/templates/' . self::OLD_NAME;
+        $dst = JPATH_ROOT . '/templates/' . self::NEW_NAME;
+
+        if (is_dir($dst)) {
+            $this->log('Bridge: templates/' . self::NEW_NAME . ' already exists — skipping copy.');
+            return true;
+        }
+
+        if (!is_dir($src)) {
+            $this->log('Bridge: source template dir not found.', 'error');
             return false;
         }
 
-        if (is_dir($new)) {
-            $this->log("Bridge: {$label} dir already exists ({$new}) — skipping rename.");
-            return true;
-        }
-
-        if (@rename($old, $new)) {
-            $this->log("Bridge: renamed {$label} dir → " . self::NEW_NAME);
-            return true;
-        }
-
-        $this->log("Bridge: failed to rename {$label} dir.", 'error');
-        return false;
+        $result = $this->recursiveCopy($src, $dst);
+        $this->log('Bridge: ' . ($result ? 'copied' : 'FAILED to copy') . ' template dir → ' . self::NEW_NAME);
+        return $result;
     }
 
-    private function updateExtensions(): void
+    private function copyMediaDir(): void
+    {
+        $src = JPATH_ROOT . '/media/templates/site/' . self::OLD_NAME;
+        $dst = JPATH_ROOT . '/media/templates/site/' . self::NEW_NAME;
+
+        if (is_dir($dst)) {
+            $this->log('Bridge: media dir already exists — skipping.');
+            return;
+        }
+
+        if (!is_dir($src)) {
+            $this->log('Bridge: source media dir not found — skipping.');
+            return;
+        }
+
+        $result = $this->recursiveCopy($src, $dst);
+        $this->log('Bridge: ' . ($result ? 'copied' : 'FAILED to copy') . ' media dir → ' . self::NEW_NAME);
+    }
+
+    private function recursiveCopy(string $src, string $dst): bool
+    {
+        if (!mkdir($dst, 0755, true) && !is_dir($dst)) {
+            return false;
+        }
+
+        $dir = opendir($src);
+        if ($dir === false) {
+            return false;
+        }
+
+        while (($file = readdir($dir)) !== false) {
+            if ($file === '.' || $file === '..') {
+                continue;
+            }
+
+            $srcPath = $src . '/' . $file;
+            $dstPath = $dst . '/' . $file;
+
+            if (is_dir($srcPath)) {
+                $this->recursiveCopy($srcPath, $dstPath);
+            } else {
+                copy($srcPath, $dstPath);
+            }
+        }
+
+        closedir($dir);
+        return true;
+    }
+
+    // ── Database updates ───────────────────────────────────────────────
+
+    private function registerExtension(): void
     {
         $db = Factory::getDbo();
 
-        try {
-            $query = $db->getQuery(true)
-                ->update('#__extensions')
-                ->set($db->quoteName('element') . ' = ' . $db->quote(self::NEW_NAME))
-                ->set($db->quoteName('name') . ' = ' . $db->quote(self::NEW_NAME))
-                ->where($db->quoteName('element') . ' = ' . $db->quote(self::OLD_NAME))
-                ->where($db->quoteName('type') . ' = ' . $db->quote('template'));
-            $db->setQuery($query)->execute();
+        // Check if MokoOnyx is already registered
+        $query = $db->getQuery(true)
+            ->select('extension_id')
+            ->from('#__extensions')
+            ->where($db->quoteName('element') . ' = ' . $db->quote(self::NEW_NAME))
+            ->where($db->quoteName('type') . ' = ' . $db->quote('template'));
+        $exists = (int) $db->setQuery($query)->loadResult();
 
-            $n = $db->getAffectedRows();
-            if ($n > 0) {
-                $this->log("Bridge: updated {$n} row(s) in #__extensions.");
-            }
+        if ($exists) {
+            $this->log('Bridge: MokoOnyx already registered in #__extensions (id=' . $exists . ').');
+            return;
+        }
+
+        // Copy the MokoCassiopeia extension row and change element/name
+        $query = $db->getQuery(true)
+            ->select('*')
+            ->from('#__extensions')
+            ->where($db->quoteName('element') . ' = ' . $db->quote(self::OLD_NAME))
+            ->where($db->quoteName('type') . ' = ' . $db->quote('template'));
+        $oldExt = $db->setQuery($query)->loadObject();
+
+        if (!$oldExt) {
+            $this->log('Bridge: MokoCassiopeia not found in #__extensions.', 'warning');
+            return;
+        }
+
+        $newExt = clone $oldExt;
+        unset($newExt->extension_id);
+        $newExt->element = self::NEW_NAME;
+        $newExt->name    = self::NEW_NAME;
+
+        // Update manifest_cache to reflect new name
+        if (is_string($newExt->manifest_cache)) {
+            $newExt->manifest_cache = str_replace(self::OLD_NAME, self::NEW_NAME, $newExt->manifest_cache);
+            $newExt->manifest_cache = str_replace(self::OLD_DISPLAY, self::NEW_DISPLAY, $newExt->manifest_cache);
+        }
+
+        try {
+            $db->insertObject('#__extensions', $newExt, 'extension_id');
+            $this->log('Bridge: registered MokoOnyx in #__extensions (id=' . $newExt->extension_id . ').');
         } catch (\Throwable $e) {
-            $this->log('Bridge: #__extensions failed: ' . $e->getMessage(), 'error');
+            $this->log('Bridge: failed to register extension: ' . $e->getMessage(), 'error');
         }
     }
 
@@ -185,54 +251,75 @@ class Tpl_MokocassiopeiaInstallerScript
     {
         $db = Factory::getDbo();
 
-        // Get all MokoCassiopeia styles (may already be renamed to mokoonyx by updateExtensions)
+        // Get all MokoCassiopeia styles
         $query = $db->getQuery(true)
             ->select('*')
             ->from('#__template_styles')
-            ->where('(' . $db->quoteName('template') . ' = ' . $db->quote(self::OLD_NAME)
-                . ' OR ' . $db->quoteName('template') . ' = ' . $db->quote(self::NEW_NAME) . ')')
+            ->where($db->quoteName('template') . ' = ' . $db->quote(self::OLD_NAME))
             ->where($db->quoteName('client_id') . ' = 0');
-        $styles = $db->setQuery($query)->loadObjectList();
+        $oldStyles = $db->setQuery($query)->loadObjectList();
 
-        if (empty($styles)) {
-            $this->log('Bridge: no styles found to migrate.');
+        if (empty($oldStyles)) {
+            $this->log('Bridge: no MokoCassiopeia styles found.');
             return;
         }
 
-        foreach ($styles as $style) {
-            $newTitle  = str_replace(self::OLD_DISPLAY, self::NEW_DISPLAY, $style->title);
-            $newTitle  = str_replace(self::OLD_NAME, self::NEW_NAME, $newTitle);
-            $newParams = is_string($style->params)
-                ? str_replace(self::OLD_NAME, self::NEW_NAME, $style->params)
-                : $style->params;
+        $this->log('Bridge: migrating ' . count($oldStyles) . ' style(s).');
 
-            $update = $db->getQuery(true)
-                ->update('#__template_styles')
-                ->set($db->quoteName('template') . ' = ' . $db->quote(self::NEW_NAME))
-                ->set($db->quoteName('title')    . ' = ' . $db->quote($newTitle))
-                ->set($db->quoteName('params')   . ' = ' . $db->quote($newParams))
-                ->where('id = ' . (int) $style->id);
+        foreach ($oldStyles as $old) {
+            $newTitle = str_replace(self::OLD_DISPLAY, self::NEW_DISPLAY, $old->title);
+            $newTitle = str_replace(self::OLD_NAME, self::NEW_NAME, $newTitle);
+
+            // Skip if MokoOnyx already has this style
+            $check = $db->getQuery(true)
+                ->select('COUNT(*)')
+                ->from('#__template_styles')
+                ->where($db->quoteName('template') . ' = ' . $db->quote(self::NEW_NAME))
+                ->where($db->quoteName('title') . ' = ' . $db->quote($newTitle));
+            if ((int) $db->setQuery($check)->loadResult() > 0) {
+                $this->log("Bridge: style '{$newTitle}' already exists — skipping.");
+                continue;
+            }
+
+            $newParams = is_string($old->params)
+                ? str_replace(self::OLD_NAME, self::NEW_NAME, $old->params)
+                : $old->params;
+
+            $new = clone $old;
+            unset($new->id);
+            $new->template = self::NEW_NAME;
+            $new->title    = $newTitle;
+            $new->params   = $newParams;
+            $new->home     = 0;
 
             try {
-                $db->setQuery($update)->execute();
+                $db->insertObject('#__template_styles', $new, 'id');
+                $newId = $new->id;
+
+                // If old was default, make new default
+                if ($old->home == 1) {
+                    $db->setQuery(
+                        $db->getQuery(true)
+                            ->update('#__template_styles')
+                            ->set($db->quoteName('home') . ' = 1')
+                            ->where('id = ' . (int) $newId)
+                    )->execute();
+
+                    $db->setQuery(
+                        $db->getQuery(true)
+                            ->update('#__template_styles')
+                            ->set($db->quoteName('home') . ' = 0')
+                            ->where('id = ' . (int) $old->id)
+                    )->execute();
+
+                    $this->log('Bridge: set MokoOnyx as default site template.');
+                }
+
+                $this->log("Bridge: created style '{$newTitle}'.");
             } catch (\Throwable $e) {
-                $this->log('Bridge: style update failed (id=' . $style->id . '): ' . $e->getMessage(), 'warning');
+                $this->log("Bridge: failed to create style '{$newTitle}': " . $e->getMessage(), 'warning');
             }
         }
-
-        $this->log('Bridge: migrated ' . count($styles) . ' style(s).');
-    }
-
-    private function copyUserFiles(): void
-    {
-        $media = JPATH_ROOT . '/media/templates/site/' . self::NEW_NAME;
-        if (!is_dir($media)) {
-            return;
-        }
-
-        // User files are already in the renamed media dir — nothing to copy.
-        // They were moved with the rename. Log for clarity.
-        $this->log('Bridge: user files preserved via directory rename.');
     }
 
     private function updateUpdateServer(): void
@@ -255,12 +342,13 @@ class Tpl_MokocassiopeiaInstallerScript
             $this->log('Bridge: update server redirect failed: ' . $e->getMessage(), 'warning');
         }
 
-        // Clear cached updates for old element
+        // Clear cached updates
         try {
-            $query = $db->getQuery(true)
-                ->delete('#__updates')
-                ->where($db->quoteName('element') . ' = ' . $db->quote(self::OLD_NAME));
-            $db->setQuery($query)->execute();
+            $db->setQuery(
+                $db->getQuery(true)
+                    ->delete('#__updates')
+                    ->where($db->quoteName('element') . ' = ' . $db->quote(self::OLD_NAME))
+            )->execute();
         } catch (\Throwable $e) {
             // Not critical
         }