diff --git a/v2rayN/v2rayN/Forms/MainForm.cs b/v2rayN/v2rayN/Forms/MainForm.cs
index d06630c2..b284409a 100644
--- a/v2rayN/v2rayN/Forms/MainForm.cs
+++ b/v2rayN/v2rayN/Forms/MainForm.cs
@@ -577,7 +577,7 @@ namespace v2rayN.Forms
 
         private void menuRemoveDuplicateServer_Click(object sender, EventArgs e)
         {
-            Utils.DedupServerList(config.vmess, out List<VmessItem> servers, config.keepOlderDedupl);
+            Utils.DedupServerList(config.vmess, out List<VmessItem> servers, config.keepOlderDedupl);
             int oldCount = config.vmess.Count;
             int newCount = servers.Count;
             if (servers != null)
@@ -1226,7 +1226,7 @@ namespace v2rayN.Forms
                         try
                         {
                             string fileName = Utils.GetPath(downloadHandle.DownloadFileName);
-                            Process process = Process.Start("v2rayUpgrade.exe", fileName);
+                            Process process = Process.Start("v2rayUpgrade.exe", "\"" + fileName + "\"");
                             if (process.Id > 0)
                             {
                                 menuExit_Click(null, null);
diff --git a/v2rayN/v2rayUpgrade/MainForm.cs b/v2rayN/v2rayUpgrade/MainForm.cs
index 41990f42..7b77ed61 100644
--- a/v2rayN/v2rayUpgrade/MainForm.cs
+++ b/v2rayN/v2rayUpgrade/MainForm.cs
@@ -41,8 +41,9 @@ namespace v2rayUpgrade
             }
             catch (Exception ex)
             {
-                showWarn("Failed to close v2rayN(关闭v2rayN失败)." + ex.StackTrace);
-                return;
+                // Access may be denied without admin right. The user may not be an administrator.
+                showWarn("Failed to close v2rayN(关闭v2rayN失败).\n" +
+                    "Close it manually, or the upgrade may fail.(请手动关闭正在运行的v2rayN，否则可能升级失败。\n\n" + ex.StackTrace);
             }
 
             try