Solving Error 0x800f0831: Installing .NET Framework on Windows Server 2019

Follow these effective methods to address the 0x800f0831 error during the .NET Framework 3.5 setup on Windows Server 2019:

1. Verify .NET Framework 3.5 presence: Navigate to the Control Panel, then Programs and Features. Search for Microsoft .NET Framework 3.5. If present, no further installation is necessary.
2. Execute the DISM command: Launch Command Prompt with administrative privileges and input: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs. Adjust 'D:' to match the drive of your Windows Server 2019 media. This will pull .NET Framework 3.5 directly from the media.
3. Run the Windows Update Troubleshooter: Access Settings, move to Update & Security, and select Troubleshoot. Choose Windows Update and initiate the troubleshooter, adhering to the provided steps to rectify update issues.
4. Seek new Windows updates: Visit Settings, navigate to Update & Security, and tap on Check for updates. Install any new updates as they may resolve the installation issues with .NET Framework 3.5.
5. Utilize the .NET Framework Repair Tool: Acquire and execute the .NET Framework Repair Tool available on Microsoft's official site. This utility aids in resolving frequent problems encountered during .NET Framework setups.