我想将WebSharper 2.5.48 alpha安装到VS 2013.Nuget软件包确实已加载，但vsix文件失败，并显示错误，表明没有可扩展的产品。检查清单显示VS 11是支持的最高版本。我破解了添加VS 12 Pro作为选项的清单文件。然后安装继续，但随后失败并出现以下错误。有什么想法吗？
10/5/2013 1:51:11 PM - The following target products have been selected...
10/5/2013 1:51:11 PM - Microsoft Visual Studio Professional 2013 RC
10/5/2013 1:51:11 PM -
10/5/2013 1:51:11 PM - Beginning to install extension to Microsoft Visual Studio Professional 2013 RC...
10/5/2013 1:51:11 PM - Install Error : Microsoft.VisualStudio.ExtensionManager.MissingReferencesException: This extension cannot be installed because the following references are missing:
- NuGet Package Manager
at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.CheckForInstallBlockers(InstallableExtensionImpl extension, IInstalledExtensionList modifiedInstalledExtensionsList, Boolean isNestedExtension, Boolean& olderVersionInstalled)
at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.InstallInternal(InstallableExtensionImpl extension, Boolean perMachine, Boolean isNestedExtension, IDictionary2 extensionsInstalledSoFar, List1 extensionsUninstalledSoFar, IInstalledExtensionList modifiedInstalledExtensionsList, AsyncOperation asyncOp, UInt64 totalBytesToWrite, UInt64& totalBytesWritten)
at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.BeginInstall(IInstallableExtension installableExtension, Boolean perMachine, AsyncOperation asyncOp)
at Microsoft.VisualStudio.ExtensionManager.ExtensionManagerService.InstallWorker(IInstallableExtension extension, Boolean perMachine, AsyncOperation asyncOp)