Microsoft.ML assembly not found in Visual Studio 2019 [Solved]

Microsoft.ML assembly not found in Visual Studio 2019 [Solved]

Issue:

I have installed ML.Net, I am trying to build a simple Machine Learning application using default template in VS 2019,
After completing all five steps (Scenario, Data, Train, Evaluate, Code)  successfully when it generate some code, I am not able to compile the code because the assembly Microsoft.ML is missing,
I tried to install the assembly using Nuget but not find the assembly,  (though I see ML.NET Model Builder is installed )

I need Microsoft.ML assembly version 1.4.0 , but not finding any. please guide

Solution:

Add another Nuget package source  with following details, and add update from there

Name: nuget.org

Source: https://api.nuget.org/v3/index.json

for details please take a look at the slide here 

Or Copy paste the following url at browser

https://docs.google.com/presentation/d/e/2PACX-1vQw6CH89z0_8o_sYE33KkV1a7qgBVerAF2U6rxfn4osj2jLsLcftYXjzon8hBA5WyQmKD-8V9EyqrzM/pub?start=true&loop=false&delayms=3000