You can try uninstall the package first, and re-install again, also sometimes, restarting the VS studio helps.
I faced this issue few days back, my ASP.NET and Web Tools 2012.2 update and Nuget SignalR package were already installed. I had to "Repair" Asp.net and Web Tools 2012.2 Update and it started showing.
- Edited by Geeker S Tuesday, September 17, 2013 9:31 PM
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