Isn't there more information in the error message than you have posted?
Did you try to debug assembly loading with Fuslogvw.exe?
https://learn.microsoft.com/en-us/dotnet/framework/tools/fuslogvw-exe-assembly-binding-log-viewer

martin wrote:

Did you register the WinSCP .NET assembly for COM?
https://winscp.net/eng/docs/library_install#registering

I did register it

Did you register the WinSCP .NET assembly for COM?
https://winscp.net/eng/docs/library_install#registering

I am trying to download a file from a ftp server and I am getting below when I run the script.

Error: Could not create object named "WinsSCP.SessionOptions" @Set sessionOptions = WScript.CreateObject("WinSCP.SessionOptions")

--beginning of the script below until the error line--

<job>
<reference object="WinSCP.Session"/>
<script language="VBScript">

Option Explicit

' Setup session options
Dim sessionOptions
Set sessionOptions = WScript.CreateObject("WinSCP.SessionOptions")