How do i install a click-once application from the browser

For many years I have been developing and updating an application in VB.Net using 'click-once' in VS. I have only been able to install it using FireFox. Recently (since about a week ago) I have been unable to install or upgrade the application. There have been no changes to my development environment.

The upload of the application seems to work OK. And have confirmed all the files are available.

I usually get a 403 Forbidden error (when doing an install/upgrade) and checked with the server service provider. All OK there. I can download the files with CoreFTP and if I change the install path, cal install from a local drive.

This is a real pain as my customers are used to updating directly from the application (as they have done for many years.)

This is the error:

************** Exception Text **************

System.Deployment.Application.DeploymentDownloadException: Downloading http://jumbuckinfo.ipage.com/Jumbuck/Application Files/Jumbuck_1_37_2_89/Jumbuck.exe.manifest did not succeed. ---> System.Net.WebException: The remote server returned an error: (403) Forbidden.

Have you any idea what might have gone wrong?