Clickonce full trust app update failing with TrustNotGrantedException on Windows 8

Question

We have a winforms clickonce application in C# which is granted full trust and signed using a valid certificate.

The application runs fine and updates correctly on W

Answer 1

From this MSDN page there are two causes. But it seems TrustNotGrantedException is usually raised when a new ClickOnce update has been deployed that uses more privileges than the previous version...

• The application uses permission elevation and the user denies the request for elevated trust; or
• The application uses Trusted Application Deployment and the digital certificate used to sign the application is not listed as a trusted publisher on the local machine. If you have deployed an update to an application, and the update uses more permissions than the previous version, and ClickOnce throws a TrustNotGrantedException, the new version will not install.

So it makes sense that it would fail to update, because the apps security level has changed since the user last installed it - so they will need to reinstall it.