The analysis concludes that Windows Server 2012 R2 includes the .NET Framework 3.5 binary files locally on the installation media. The issue is rarely a missing file, but rather a misconfiguration of the installation source (SxS folder) or a lack of internet access for Windows Update fallback.
Installing .NET Framework 3.5 on Windows Server 2012 R2 Installing .NET Framework 3.5 on Windows Server 2012 R2 is a common requirement for running legacy applications, but it often encounters errors like or 0x800F081F because the necessary source files are not included in the default installation image to save space. The analysis concludes that Windows Server 2012 R2
: If you do not have the physical media, you can download the Windows Server 2012 R2 ISO from the Microsoft Volume Licensing Service Center (VLSC) Evaluation Center PowerShell script : If you do not have the physical
Open or Command Prompt as Administrator. The analysis concludes that Windows Server 2012 R2
The required file is: microsoft-windows-netfx3-onDemand-package.cab