I also had a problem, the problem is aggravated by the download link, which now works only for Visual Studio 2017, and installing the package from the download link did nothing for VS2015, although it took 5 GB of space.
I have searched everywhere for how to do this with the Nu Get package manager, and I could not find a solution.
It turns out that this is even easier, all you have to do is right-click the project or solution in the solution explorer from Visual Studio and click "Install Missing Components"
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