Note: If this fails with an error code (like 0x800F0906), it means Windows cannot connect to the update servers. You must use above.
Method 2: The Control Panel Method (Requires Intermittent Internet)
Insert your Windows installation USB or double-click your Windows ISO file to mount it.
Press . The Deployment Image Servicing and Management (DISM) tool will extract the framework directly from the media and install it. This process takes less than two minutes and requires zero internet. Method 3: Enable .NET Framework 3.5 via Windows Features Note: If this fails with an error code
Copy and paste the following command into the window (replace D: with your actual Windows media drive letter): DISM.exe /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess
For , the official way to install .NET Framework 3.5 is by enabling it through Windows Features or using the DISM command with installation media. Starting with Windows 11 Build 28000 (26H1), it is also available as a standalone installer . Official Download & Installation Methods Standard Online Enablement (Easiest)
Click . Windows will search for the files and activate the framework. Troubleshooting Common Installation Errors Error Code 0x800F0906 Method 3: Enable
/enable-feature /featurename:NetFX3 : Tells Windows to enable the specific .NET Framework 3.5 feature.
Save the file with a .bat extension, for example, install_dotnet35.bat .
Go to > Programs > Turn Windows features on or off . Confirm that .NET Framework 3.5 is now checked. 📥 Official Download Links Note: If this fails with an error code
For Windows 11 (Build 28000 and later), Microsoft has transitioned .NET 3.5 to a standalone deployment . You can download the .NET Framework 3.5 Service Pack 1 (Full Package) directly from the Official Microsoft Download Center Offline DISM Method:
Navigate to the official Microsoft .NET Framework 3.5 Service Pack 1 (Runtime) download hub.
If you attempt the standard Windows "Turn Windows features on or off" method and receive error 0x800F081F, it means Windows cannot find the source files.