Clickonce signed application fails with "has a different computed hash than specified in manifest". Mage fails to resolve issue
Is there any chance you are trying to deploy a WPF application and using Visual Studio 2012 or later? If so, you have to use the "AfterCompile" setting in your project file to sign the application, or you end up with the hash mismatch.
See this stackoverflow post: SignTool Not Signing ClickOnce App Using SHA256, Only Uses SHA1
Which links to Robin's excellent blog solution: http://robindotnet.wordpress.com/2013/04/14/windows-8-and-clickonce-the-definitive-answer-revisited/
First thing to check: Publish - Updates - Application Updates - URL is correct (e.g. you have a test URL and a deployment URL)
Second thing to check: remove System.Deployment reference and add it back in. We had the problem after moving project from VS2012 to VS2015, and this action got it working again after hours of trying different ideas.
btw - here's an easy guide to how to do the accepted answer:
right click the project and select "Unload Project"
right click the project and select "Edit"
add the following before the final project close tag:
<Target Name="AfterCompile" Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<Exec Command=""C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Bin\signtool.exe" sign /f "C:\temp\myPFX.pfx" /p "admin" /v "$(ProjectDir)obj\$(ConfigurationName)\$(TargetFileName)"" />
</Target>change the location of signtool.exe and pfx (signature) file to your own locations
save the project file
reload the project
I'm still using Visual Studio 2015, app config transformation per build configuration, TFS and using different release branches. After much research, I was not able to find a solution to fix this issue until I started using the publish wizard button.
If you are using VS2015, first try publishing with the "Publish Wizard..." button instead of the "Publish Now" button. Apparently, the publish wizard button updates the manifest file after the app config transformation has occurred.