I am sure this is something simple but I publish my solution, with setup.exe, application file and Application Files directory. Then in the folder containing the .application file I select all the files and create a zipfile.
The I create a release, give it a name and upload the zip file but I always get.
Invalid ClickOnce zip file. Please specify a valid Installation Folder URL (http://ggcstatus.codeplex.com/releases/clickonce/).
The URL I specify in VS matches exactly.