How to solve the error code 0x800f081f: .NET Framework installation failed in Windows 8.1

There are several steps you can take to solve the error code 0x800f081f when installing .NET Framework in Windows 8.1:

1. Check for Windows updates: Make sure your Windows 8.1 is up to date with the latest updates. Go to Settings > Update & Security > Windows Update and click on Check for updates.
2. Use the .NET Framework Repair Tool: Microsoft provides a .NET Framework Repair Tool that can help fix common installation issues. Download and run the tool from the Microsoft website.
3. Install .NET Framework manually: If the above steps don't work, you can try installing .NET Framework manually. Download the .NET Framework installer from the Microsoft website and run it as an administrator.
4. Disable antivirus software: Sometimes, antivirus software can interfere with the installation process. Try disabling your antivirus software temporarily and then install .NET Framework.
5. Clean boot your computer: A clean boot can help identify and resolve software conflicts that might be causing the installation issue. Follow the steps in this Microsoft article to perform a clean boot.