First off let me say that I am new to dnn and got handed this task after another failed at it.    I will try to give as much info as possible and the steps taken.

We are on 5.2.03 and noticed there were critical updates listed.    Another resource tried to upgrade months ago and failed so it was droped.   I really need to get the site to the latest version so I am following up path recommendations.

1.  Backed up DNN directory
2.  Backed up DB
3.  downloaded 5.4.4 and overlaid the Website directory with contents. 
4.  tried to bring up the site and got the following info:

Compiler Error Message: BC30002: Type 'Web.HttpResponse' is not defined.

Source Error:

Line 32:         Implements System.Web.IHttpHandler
Line 33:
Line 34:         Private Sub RenderToResponseStream(ByVal Response As Web.HttpResponse, ByVal controller As XmlController)
Line 35:             ' save script timeout
Line 36:             Dim scriptTimeOut As Integer = HttpContext.Current.Server.ScriptTimeout
 

Source File: C:\DotNetNuke\Website\App_Code\XML\Handlers\download.vb    Line: 34

5.  Researched and instructions and it was stated that I needed to restore and install xml module XML_04.03.05_Install.zip.
6.  Did the restore and downloaded the xml module and installed using extensions.    No issues or problems were identified with the install and it now shows up as being installed.
7.   Did a backup again.   Repeated step 3.
8.   Brought up the site and got the very same error.
9.   Not sure where to go now.

Thanks for you help in advance.   Detailed instructions would be appreciated since I am very new to dnn.

Mike