How to manually uninstall a Visual Studio 2010 extension?

Question

So I got prompted to download the latest NuGet Package Manager in VS2010. All previous updates (including this) has failed with:
VSIXInstaller.SignatureMismatchExc

Answer 1

To uninstall NuGet, you must first run Visual Studio as Administrator, then you will see the Uninstall option available.

Restart VS, but this time run it as your normal account. When you install NuGet going forward, you should be able to update to future versions without running as Administrator.

I believe this issue occurs due to NuGet being installed with MVC 3. I hope in the future we no longer bundle NuGet with other software.

Answer 2

If you want to delete/uninstall Nuget package which is applied to multiple projects in your solutions then go to:

1. Tools-> Nuget Package Manager -> Manage Nuget Packages for Solution

2. In the left column where is 'Installed packages' select 'All', so you'll see a list of installed packages and Manage button across them.

3. Select Manage button and you'll get a pop out, deselect the checkbox across project name and Ok it

The rest of the work Package Manager will do it for you.

Answer 3

Maybe this is fixed now. There is a very new release. http://visualstudiogallery.msdn.microsoft.com/27077b70-9dad-4c64-adcf-c7cf6bc9970c/

http://docs.nuget.org/docs/reference/known-issues#Upgrading_to_latest_NuGet_from_an_older_version_causes_a_signature_verification_error. When viewing the logs, you might see a mention of a SignatureMismatchException. To prevent this from occurring, there is a Visual Studio 2010 SP1 hotfix you can install. Alternatively, the workaround is to simply uninstall NuGet and then install it from the VS Extension Gallery. See http://support.microsoft.com/kb/2581019 for more information.