diff --git a/classes/class_cache_redis.php b/classes/class_cache_redis.php
index 08718b7a..c279f644 100644
--- a/classes/class_cache_redis.php
+++ b/classes/class_cache_redis.php
@@ -30,6 +30,9 @@ class class_cache_redis {
     private function connect()
     {
         $config = config('database.redis');
+        if (empty($config['host'])) {
+            return false;
+        }
         $redis = new Redis();
         $params = [
             $config['host'],
diff --git a/include/core.php b/include/core.php
index 473ad583..e66edd18 100644
--- a/include/core.php
+++ b/include/core.php
@@ -3,8 +3,12 @@ if(!defined('IN_TRACKER')) {
     die('Hacking attempt!');
 }
 if (!file_exists($rootpath . '.env')) {
-    header('Location: ' . getBaseUrl() . 'install/install.php');
-    exit(0);
+    $installScriptRelativePath = 'install/install.php';
+    $installScriptFile = $rootpath . "public/$installScriptRelativePath";
+    if (file_exists($installScriptFile)) {
+        header('Location: ' . getBaseUrl() . $installScriptRelativePath);
+        exit(0);
+    }
 }
 error_reporting(E_ALL);
 ini_set('display_errors', 0);
diff --git a/nexus/Install/Install.php b/nexus/Install/Install.php
index 7ed4f78e..af234eb3 100644
--- a/nexus/Install/Install.php
+++ b/nexus/Install/Install.php
@@ -465,6 +465,7 @@ class Install
                 continue;
             }
             $this->doLog("[IMPORT DATA] $table, $sql");
+            sql_query("truncate table $table");
             sql_query($sql);
         }
         return true;
diff --git a/nexus/Install/install/install.php b/nexus/Install/install/install.php
index 5f16899b..7ca81879 100644
--- a/nexus/Install/install/install.php
+++ b/nexus/Install/install/install.php
@@ -108,9 +108,9 @@ if ($currentStep == 4) {
     $pass = $settingTableRows['pass'];
     while ($isPost) {
         try {
-            $install->importInitialData();
-            $install->saveSettings($settings);
             $install->createSymbolicLinks($symbolicLinks);
+            $install->saveSettings($settings);
+            $install->importInitialData();
             $install->nextStep();
         } catch (\Exception $e) {
             $_SESSION['error'] = $e->getMessage();
diff --git a/nexus/Install/settings.default.php b/nexus/Install/settings.default.php
index 28ecc0ed..bc7f784a 100644
--- a/nexus/Install/settings.default.php
+++ b/nexus/Install/settings.default.php
@@ -91,8 +91,8 @@
     'smtp_from' => NULL,
     'smtpaddress' => 'smtp.qq.com',
     'smtpport' => '25',
-    'accountname' => '',
-    'accountpassword' => '',
+    'accountname' => '353856593@qq.com',
+    'accountpassword' => 'zixbeopslzidbgbi',
   ),
   'security' => 
   array (
@@ -347,8 +347,8 @@
   'code' => 
   array (
     'mainversion' => 'NexusPHP',
-    'subversion' => 'Standard v1.5 Beta 4 by xiaomlove',
-    'releasedate' => '2010-09-19',
-    'website' => '<a href="http://nexusphp.cn">http://nexusphp.cn</a>',
+    'subversion' => 'v1.6.0-beta1',
+    'releasedate' => '2021-01-28',
+    'website' => '<a href="http://nexusphp.cn" target="_blank">http://nexusphp.cn</a>',
   ),
 );
\ No newline at end of file