Disclaimer: Acknowledgement on the content for this post was taken from NuGet site
In Visual Studio, click Tools and then Extension Manager. Naviging to Online, find the NuGet Package Manager extension and click Download.
In the Installer dialog box, click Install.
When installation is complete, close and re-open Visual Studio.
NuGet is now ready to use.
You can update NuGet using the Visual Studio Extension Manager. Navigate to the Extension Manager and click on the Updates tab to check for updates.
If there is a new version of NuGet you will see it in the list of available updates.
Select NuGet in the list and click Update. When the update is complete, close and re-open all open instances of Visual Studio.