Fixing Error 0x800f0929: Installing .NET Framework 3.5 on Windows Server 2012

To tackle the installation error 0x800f0929 for .NET Framework 3.5 on Windows Server 2012, follow these guided steps:

1. Verify existing installation: Navigate to Control Panel > Programs and Features > Turn Windows features on or off. Check if .NET Framework 3.5 is already active on your system.
2. Implement the DISM command: Launch Command Prompt as an administrator and enter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (substitute D:\ with the appropriate drive letter of your Windows Server 2012 installer).
3. Run the Windows Update Troubleshooter: Access Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update. Execute the troubleshooter and resolve any complications with Windows Update.
4. Manually download and install .NET Framework 3.5: Visit the Microsoft Download Center, download the .NET Framework 3.5 installer, and follow the prompts to complete the installation.
5. Search for Windows updates: Open Control Panel > Windows Update and search for available updates. Ensure you install any updates related to .NET Framework or Windows Server 2012.