Resolving the Error Code 0x800f0831: Installing .NET Framework 3.5 on Windows Server 2019

To address the error code 0x800f0831 while attempting to install .NET Framework 3.5 on Windows Server 2019, consider the following steps:

1. Verify .NET Framework 3.5 installation: Navigate to the Control Panel, then Programs and Features, and search for Microsoft .NET Framework 3.5 to see if it's already installed. If found, no further installation is required.
2. Deploy using DISM command: Launch Command Prompt with administrative privileges and enter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs, adjusting 'D:' to your media's drive letter. This command facilitates the installation from your setup media.
3. Utilize the Windows Update Troubleshooter: Access the Settings app, navigate to Update & Security, select Troubleshoot, then Windows Update, and execute the troubleshooter following the provided prompts to resolve update issues.
4. Perform Windows updates: Again in Settings, under Update & Security, opt for Check for updates and install any that are available. Frequently, updating Windows resolves installation issues with .NET Framework 3.5.
5. Run the .NET Framework Repair Tool: Obtain and execute the .NET Framework Repair Tool available on Microsoft's official website to repair common issues related to .NET Framework setups.