Windows Updates on Server operating systems fail to install with Exit code 193.
Symantec Patch Management 8.1 RU6
"Deployment failed. Status is 193 (0xC1) - 'The vendor patch file is missing.'","Deployment Engine","AeXPatchDeployment.exe"
To resolve the issue, open the Remediation Center in the Symantec Management Console. For each of the problematic bulletins Right Click>Recreate packages. Note: This will create new _server MSU files in the update directories. The older/duplicate MSU files need to be deleted manually.
This state is expected to be temporary and only occurs if the Bulletins were downloaded before metadata changes applied.
Also make sure the "Revise Software Update policies" is enabled on the Import Patch Data for Windows page.
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