What is Nuget Package Manager?
Its is the package manager for .NET which used to upload or consume packages into Nuget gallery. Nuget gallery is the central package repository used by all package authers and consumers
Official portal https://www.nuget.org/
How to upgrade Package Manager version?
Step 1 : Remove existing Nuget client version (Visual Studio > Tools > Extension & Update > remove from "Installed" )
Step 2: Install newer version of Nuget client (Visual Studio > Tools > Extension & Update > install new from from "Online")
Why one need to upgrade Nuget client version?
In order to download newer package from its gallery requires newer version of Nuget client.
Example, if you want to download EF core (install-package Microsoft.EntityframeworkCore -version 3.4.4) then you need to have Nuget client version 3.4.4 and above version
Note: VS 2015 support max of Nuget client version 3.0.0
