The safest way to get the standalone installer is directly from Microsoft.
Locate your . If you do not have one, you can download it for free directly from Microsoft's official website using their Media Creation Tool. Right-click the ISO file and select Mount .
If you do not have a Windows ISO file handy, several trusted tech communities have developed free, automated scripting utilities that package the official .cab deployment files into a single click.
Click . If the source files are present on your hard drive, Windows will configure the feature immediately. The safest way to get the standalone installer
Example: If your USB drive is drive D , the command would look like this:
This guide provides completely free, safe, and reliable methods to install .NET Framework 3.5 offline on Windows 10 and Windows 11.
: Open the mounted drive and navigate to the sources\sxs folder. Ensure the file named microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab is present. Right-click the ISO file and select Mount
Starting with Windows 11 version 26H1 (Build 28000), Microsoft has changed how this is handled. Microsoft Learn Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
After installation, test it by pressing Win + R , typing regedit , and navigating to:
The /LimitAccess switch tells DISM not to go online to Windows Update, ensuring it uses only your specified local source. If the source files are present on your
Click the Windows Start menu, type , right-click Command Prompt , and select Run as administrator .
Microsoft provides a direct, trusted offline installer for .NET Framework 3.5 SP1.