Hi NMarkGraves,
This error occurs when one or more files listed in the application manifest cannot be found on the server. You can open the application manifest in a text editor and verify that you have uploaded all relevant files for deployment.
You can also try to clear the clickonce cache and reinstall.
And here some related documents you can refer to.
How to: Set a Custom Log File Location for ClickOnce Deployment Errors
Troubleshooting Specific Errors in ClickOnce Deployments
Best Regards,
Daniel Zhang
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