Download files from authenticated web HTTP Connection Manager in SSIS

Problem: I am in process of automating the download of files from authenticated web .I tried different alternatives one with HTTP connection Manager and the other using Script task

HTTP Connection Manager

I have included URL, Username and password of the web, but when i try to test the connection, the following error occurs.

Unable to connect to the remote server

Questions:

1. For URL , does it should point straight to the server or Login page? I tried either ways, but it didn't work


2. Do I need to specify anything in Domain box and Client certificate?


3. What is Client Certificate?

Script task

I have followed the link for downloading the files using script task

Download source file from website with SSIS

it throws unknown exception, not sure what it is?

Questions:

Is there a simple solution using Script task?

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In either cases , Can you please help me in connecting to authenticated web and download the files and also check if files already exists. I dont have prior experience in using SSIS to download files from web. I have tried different solutions from here, none of them worked.