Use the "Turn Windows features on or off" menu.
Dism /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Use the "Turn Windows features on or off" menu
The definitive way to install .NET Framework 3.5 offline on Windows 10 or 11 involves the operating system’s own DISM (Deployment Imaging Service and Management Tool) command and a copy of the Windows installation ISO that matches your system’s edition, language, and architecture (64-bit). Here is the process in summary: Access Denied
For users who need to install this on multiple computers or have no internet access, the official offline installer is the best method. Use the "Turn Windows features on or off" menu
Access Denied. You did not run the Command Prompt as Administrator. Fix: Right-click the Terminal or CMD icon and select "Run as administrator" .
Disclaimer: Always scan third-party downloads with Windows Defender before running.