Solving Error Code 0x800f081f: Missing Source Files on Windows Server 2016

Addressing error code 0x800f081f in Windows Server 2016 involves several corrective steps:

1. Utilise DISM Tool: Access Command Prompt with administrator privileges and input: DISM /Online /Cleanup-Image /RestoreHealth. This process will identify and fix any corrupt system files.
2. Run Windows Update Troubleshooter: Navigate to Settings > Update & Security > Troubleshoot > Windows Update to deploy the troubleshooter.
3. Manually Install Files: If specific files are missing, manually download and install them from Microsoft's official site.
4. Adjust Group Policy Settings: Verify that Group Policy settings do not hinder update installations. Access the Local Group Policy Editor > Computer Configuration > Administrative Templates > System, and ensure 'Specify settings for optional component installation and component repair' is enabled.
5. Verify Windows Update Service: Ensure the Windows Update service is operational by checking its status in Services, setting it to Automatic and starting it if necessary.
6. System Restore: If other methods fail, consider restoring your system to an earlier state before the error manifested.

Following these instructions should effectively resolve the 0x800f081f error, allowing for successful updates and installations on Windows Server 2016.