How to solve the error code 0x800f0923: The source files could not be downloaded in Windows Server 2016

There are several steps you can take to solve the error code 0x800f0923 in Windows Server 2016:

1. Check your internet connection: Make sure your server is connected to the internet and that there are no connectivity issues.
2. Disable any third-party antivirus software: Sometimes, third-party antivirus software can interfere with the installation process. Try disabling any antivirus software temporarily and see if that resolves the issue.
3. Run the Windows Update troubleshooter: Windows Server 2016 has a built-in troubleshooter that can help identify and fix issues with Windows Update. To run the troubleshooter, go to Settings > Update & Security > Troubleshoot > Windows Update.
4. Check your firewall settings: Make sure that your firewall is not blocking the Windows Update service. You may need to add an exception to your firewall settings to allow Windows Update to download and install updates.
5. Manually download and install the update: If all else fails, you can try manually downloading and installing the update from the Microsoft Update Catalog. To do this, go to the Microsoft Update Catalog website, search for the update you need, and download it. Then, run the downloaded file to install the update.