Starting with Windows 11 Build 28000 (26H1) , .NET 3.5 is no longer an optional "Feature on Demand" and must be installed via this standalone package.
Right-click the Netfx35.exe file and select Run as administrator .
This is the only officially supported method for completely offline systems. You will need a Windows ISO, DVD, or USB for your specific OS version. Starting with Windows 11 Build 28000 (26H1) ,
If your machine has an intermittent internet connection and you want Windows to handle the process automatically without downloading a separate file, you can utilize the built-in Windows Features menu. Press the to open the Run dialog box.
Downloading and installing the .NET Framework 3.5 offline installer for Windows 10 and 11 can be challenging, but it is still possible. By following the steps outlined in this article, you should be able to successfully install .NET Framework 3.5 on your Windows 10 or 11 system. If you encounter any issues during the installation process, refer to the troubleshooting tips provided. You will need a Windows ISO, DVD, or
On the page, Microsoft said: “For Windows 10 and 11, use the ‘microsoft-windows-netfx3-ondemand-package’.”
Open the Run box ( Win + R ), type gpedit.msc , and press Enter to open the . Downloading and installing the
If you have a Windows 10 or 11 ISO, USB, or DVD, you can install .NET 3.5 without downloading anything new. This method uses the tool to pull the required files directly from your installation media.
: Deployment on machines with no internet access at all.
Open the Windows Start Menu, type , right-click Command Prompt , and select Run as administrator .
After restarting, you can quickly check if the installation was successful: