Method 1: Installing .NET Framework 3.5 Offline Using Windows ISO (Recommended)
Click the button to save the dotnetfx35.exe file (approx. 231 MB) to your local storage. Method 1: Installing
If you need help resolving a specific error code during installation, tell me the you see or what Windows version build you are targeting so I can provide a targeted fix. Method 1: Installing
Once the operation completes successfully, restart your computer. Method 1: Installing
Running the .exe directly on Windows 10 or 11 sometimes triggers an automated Windows Update lookup. To force it to install completely offline, use the command line:
Установка .NET Framework 3.5 в Windows 10 - Microsoft Learn