.NET Framework installation failure

What is DOTNET-FRAMEWORK-INSTALL-FAIL?

The .NET Framework installation or update fails with errors such as 0x80070002, 0x800F081F, or 'HRESULT 0x800f0906'. Many Windows applications and system tools depend on specific .NET Framework versions (2.0, 3.5, 4.8). The most common failure is .NET 3.5 requiring Windows installation media to install the optional Windows feature.

Common Causes

• Windows optional feature source files unavailable
• Windows Update dependency missing
• Corrupted .NET framework files

Step-by-Step Fix Guide

• 1
  Enable .NET 3.5 via Windows Features with installation media

  The DISM command with /Source pointing to Windows installation media (or ISO) is the most reliable method to install .NET 3.5 without internet access.

• 2
  Use DISM to install .NET from Windows media

  For .NET 4.8+, use Windows Update or download the offline installer from Microsoft's download center.

• 3
  Run .NET repair tool

Commands & Diagnostics