FlightXML Error Please Help!

Im Having this Error Please Help, Currently using Visual Studio 2015 as Development Tool

In my FlightXML2.App Config I did change the http to https cause when using HTTP it will post an error msg:
“The provided URI scheme ‘http’ is invalid; expected ‘https’.”

Once I put it back to HTTPS error goes:

An error occurred while making the HTTP request to https://flightxml.flightaware.com/soap/FlightXML2/op. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server.

This usually occurs with older versions of .NET or unpatched systems. Microsoft’s documentation here: Transport Layer Security (TLS) best practices with the .NET Framework - .NET Framework | Microsoft Docs