How to Fix Error Code 0x800f0930 Installing .NET Framework 3.5 on Windows Server 2012

To resolve error code 0x800f0930 while attempting to install .NET Framework 3.5 on Windows Server 2012, follow these troubleshooting steps:

1. Verify .NET Framework 3.5 installation: Access Server Manager, navigate to 'Add Roles and Features' wizard, and check if .NET Framework 3.5 is already installed. If present, consider reinstalling it.
2. Implement DISM command: Open Command Prompt with administrative privileges and execute: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (alter 'D:' to match the installation media drive letter) to install from media.
3. Check for updates: Navigate to Windows Update settings, search for updates, especially those related to .NET Framework, and install them before attempting the .NET Framework 3.5 installation again.
4. Adjust Group Policy settings: For domain-connected servers, ensure that 'Specify settings for optional component installation and component repair' is enabled and set to allow direct download from Windows Update rather than WSUS.
5. Temporarily disable antivirus: Antivirus programs can block installations. Disable your antivirus temporarily and retry the .NET Framework 3.5 installation.
6. Ensure Windows Installer service is active: Verify in the Services console that the Windows Installer service is operational. If not, start it and proceed with the .NET Framework installation.