Are you using the VS 2015 RC? If so, you can run nuget update -self to update the version of nuget that supports Xamarin targets. The updated version won’t be used by VS, but will at least let you nuget directly from the command line.
Are you using the VS 2015 RC? If so, you can run nuget update -self to update the version of nuget that supports Xamarin targets. The updated version won’t be used by VS, but will at least let you nuget directly from the command line.