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

I had the same problem and solved it with the already mentioned solution but needed more attempts. It's necessary to restart VS completely after uninstalling and installing the NuGetPackage extension and on my system it was not working until I closed my opened solution. Hopefully NuGetPackage extension gets more stable in the near future.