Overcoming Error Code 0x800f0831 During .NET Framework 3.5 Installation on Windows Server 2016

Encountering error code 0x800f0831 while installing .NET Framework 3.5 on Windows Server 2016 can be resolved through several steps:

1. Verify Installation: Navigate to Control Panel > Programs and Features to check if .NET Framework 3.5 is already installed on your server. If present, no further installation is required.
2. Utilise DISM Command: Launch Command Prompt as an administrator and execute: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs. Adjust 'D:' to your installation media's drive letter.
3. Installation Media Method: Insert the Windows Server 2016 installation media. Navigate to the 'Sources' folder and locate the 'sxs' folder. Copy this folder to an accessible location on your server. Execute in Command Prompt: Dism /online /enable-feature /featurename:NetFx3 /All /LimitAccess /Source:C:\sxs, substituting 'C:' with the copied folder's drive letter.
4. Update Windows Server: Ensure your system is up to date by going to Settings > Update & Security > Windows Update. Install any pending updates before attempting the installation of .NET Framework 3.5 again.
5. Disable Antivirus: Temporarily disable any antivirus software as it can occasionally block the installation of new programs, including .NET Framework 3.5.

Following these guidelines should allow you to successfully install .NET Framework 3.5 and bypass the error code 0x800f0831 on Windows Server 2016.