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

To address the error code 0x800f0929 when attempting to install .NET Framework 3.5 on Windows Server 2012, follow these structured steps:

1. Verify .NET Framework 3.5 installation status: Navigate to Control Panel > Programs and Features > Turn Windows features on or off. Check if .NET Framework 3.5 is listed and uninstalled.
2. Execute DISM command: Launch Command Prompt as an administrator. Enter: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs (substitute D:\ with the appropriate drive letter of your installation media). This facilitates .NET Framework 3.5 installation directly from your media.
3. Run Windows Update Troubleshooter: Access Control Panel > Troubleshooting > System and Security > Resolve Windows Update issues. Follow prompts to identify and correct any update problems.
4. Manually download and install .NET Framework 3.5: Visit the Microsoft Download Center, download the .NET Framework 3.5 installer, and execute the package as guided by the prompts.
5. Inspect for updates: Open Control Panel > Windows Update, search for new updates, specifically those pertaining to .NET Framework or Windows Server 2012, and apply necessary updates.