How to Overcome Installation Error 0x800f0929 for .NET Framework 3.5 in Windows Server 2012

Address error code 0x800f0929 effectively to ensure successful installation of .NET Framework 3.5 on Windows Server 2012 through the following steps:

1. Verify .NET Framework 3.5 installation: Navigate to Control Panel > Programs and Features > Turn Windows features on or off to check if .NET Framework 3.5 is already enabled.
2. Execute DISM command: Launch Command Prompt as an administrator and type: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (ensure to replace D: with your actual installation media's drive letter).
3. Run Windows Update Troubleshooter: Access Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update, and follow the prompts to address any update issues.
4. Manually install .NET Framework 3.5: Visit the Microsoft Download Center, download the .NET Framework 3.5 installer, and execute the setup following the guided instructions.
5. Check for Windows updates: Open Control Panel > Windows Update, search for new updates, and install any that relate to .NET Framework or Windows Server 2012 to ensure all components are up to date.