Hi @Salim Njopeka ,
The error is due to DeploymentDownloadException.
According to the Troubleshooting Errors Documentation: ClickOnce cannot Establish a network connection to the server. Examine the server's availability and the state of your network.
Your target update address is not available.
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.