VS2015 - The 'NuGetPackage' package did not load correctly

Question

Just opened up VS 2015 Enterprise RTM, opened up an existing working project, getting the following error:

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Microsoft Visual Studio

Answer 1

Go into :

Tools
Extensions and Updates

Insert on the search box on the right Nuget Package Manager and set it up (full setup) .

Following that you would have the Manage Nuget Packages in the Tools section .