Right-click the Start button and select Terminal (Admin) or Command Prompt (Admin) .

Method 1: Using Windows 11 Installation Media (Most Reliable)

If you have the offline installer, you can use it to install .NET Framework 3.5 when you enable this feature.

⚠️ On Windows 11, running this file alone and ask to download files from Windows Update. To make it truly offline, proceed to Method 2.

Add-WindowsCapability -Online -Name NetFx3~~~~ -Source D:\sources\sxs