Hello
We used version 2.1 Community until yesterday and when uninstalling the old version, then we put the license of 4.8.1 (by nuget) a screen with Status Code 200 No Response appears on the IIS server every time we try to go to the Login.aspx page to Site.master.aspx.

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Login.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="XXX.YYY.Apresentacao.Login" %>

<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>

<!DOCTYPE html>

<html>
<head id="Head1" runat="server">
	
	<title> :: XXX ::</title>
	
	<link rel="stylesheet" type="text/css" href="~/Styles/estilo.css"/>

	<link rel="shortcut icon" href="~/Imagem/favicon.ico" type="image/x-icon"/>

	<ext:ResourceManager ID="ResourceManager1" runat="server"></ext:ResourceManager>
	
	<meta http-equiv="X-UA-Compatible" content="IE=11" /> 

	<script type="text/javascript">
		Ext.net.DirectEvent.timeout = 3600000000;
		Ext.Ajax.timeout = 36000000000;
		Ext.override(Ext.form.Basic, { timeout: Ext.Ajax.timeout / 1000 });
		Ext.override(Ext.data.proxy.Server, { timeout: Ext.Ajax.timeout });
		Ext.override(Ext.data.Connection, { timeout: Ext.Ajax.timeout });
	</script>

	<!--<style type="text/css">
	v\:* {
		behavior:url(#default#VML);
	}
	</style>-->

</head>
<body style="background-color:#f7f8f8;">
	<div id="ext-comp-1003" class=" x-panel x-panel-noborder x-border-panel" style="left: 0px; top: 0px; ">
		<div class="x-panel-bwrap" id="ext-gen15">
			<div class="x-panel-body x-panel-body-noheader x-panel-body-noborder" id="ext-gen16" style="height: 70px;">
				<div id="header" style="height:70px;">            
					<div class="api-title"> 
						<em>XXX</em>                
					</div>            
					<div class="api-title">                 
						<em>XXX</em>
					</div>            
				</div>
			</div>
			
		</div>
	</div>

	<form id="FormLoginId" runat="server">     
		<ext:Window ID="WindowLoginId" runat="server" Closable="false" Resizable="false" Height="150" Icon="Lock" Title="Login" Draggable="false" Width="350" Modal="false" BodyPadding="5" Layout="Form" StyleSpec="background-color:acacbd;">                
			<Items>
				<ext:TextField AutoFocus="true" AutoFocusDelay="50" ID="loginId" runat="server" FieldLabel="Login" AllowBlank="true" BlankText="CPF ou CPNJ obrigatório." EnableKeyEvents="true" EnforceMaxLength="true" MaxLength="60" EmptyText="neste campo digite seu login">                                               
					
					<Listeners>                    
						<KeyPress Handler="if ((e.getKey() == e.ENTER)) { #{senhaId}.focus(false, 100); }" />
					</Listeners>

				 </ext:TextField>

				 <ext:TextField ID="senhaId" runat="server"  InputType="Password" FieldLabel="Senha" AllowBlank="true" EmptyText="de até 20 caracteres" EnableKeyEvents="True" EnforceMaxLength="true" MaxLength="20">         
				
					 <Listeners>							
							<KeyPress Handler="if ((e.getKey() == e.ENTER)){ #{LoginButtonId}.fireEvent('click'); }"/>
					</Listeners>                

				 </ext:TextField>                
			</Items>
			<Buttons>

				<ext:Button ID="LoginButtonId" runat="server" Text="Entrar" Icon="Accept">
					<DirectEvents>
						
						<Click OnEvent="Logar_Click">							
							<EventMask ShowMask="true" Msg="Aguarde..." MinDelay="1000" />
						</Click>

					</DirectEvents>
				</ext:Button>
			</Buttons>                           
		</ext:Window>  
		

	</form> 
</body>
</html>
Login.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Newtonsoft.Json;
using System.IO;
using System.Security.Cryptography;
using Ext.Net;
using System.Web.Security;

namespace XXX.YYY.Apresentacao
{
    public partial class Login : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void Logar_Click(object sender, DirectEventArgs e)
        {            
            Response.Redirect("/");
        }


    }
}
Thanks.