I got into VS 2010 Premium this morning, and was notified of the fact that there was a new version of the NuGet installer add-in.  So I went to install it.  However, I got an error message.  Here's the error message:

 

12/13/2011 9:12:02 AM - Verifying matching extension signatures before updating...Installed Extension Path: C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\Extensions\Microsoft Corporation\NuGet Package Manager\1.5.20902.9026\Update Extension Path: c:\users\rodf\appdata\local\temp\tmp4e74.tmp12/13/2011 9:12:02 AM - VSIXInstaller.SignatureMismatchException: The signature on the update version of 'NuGet Package Manager' does not match the signature on the installed version. Therefore, Extension Manager cannot install the update.   at VSIXInstaller.Common.VerifyMatchingExtensionSignatures(IInstalledExtension installedExtension, IInstallableExtension updateExtension)   at VSIXInstaller.InstallProgressPage.BeginInstallVSIX(SupportedVSSKU targetAppID)12/13/2011 9:12:02 AM - Install Error : VSIXInstaller.SignatureMismatchException: The signature on the update version of 'NuGet Package Manager' does not match the signature on the installed version. Therefore, Extension Manager cannot install the update.   at VSIXInstaller.Common.VerifyMatchingExtensionSignatures(IInstalledExtension installedExtension, IInstallableExtension updateExtension)   at VSIXInstaller.InstallProgressPage.BeginInstallVSIX(SupportedVSSKU targetAppID)