Many users try the GUI approach: Control Panel > Programs > Turn Windows features on or off > Check .NET Framework 3.5 > OK.
Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5
Method 2: Download the Official Microsoft Standalone Installer (Requires Temporary Internet)
Type or paste the following command into the prompt (replace X: with your actual mounted drive letter): Net Framework 3.5 Offline Installer Windows 10 64 Bit
This is the most reliable way to install it without an internet connection. Install .NET Framework 3.5 on Windows 10 - Microsoft Learn
Copy and paste the following Deployment Image Servicing and Management (DISM) command into the window (replace D: with your actual installation media drive letter):
To install .NET Framework 3.5 offline on Windows 10 64-bit, you must use the original Windows installation media. Unlike older versions of Windows, the only supported offline method for Windows 10 is through the deployment of "Side-by-Side" (SxS) files found on your OS installation disk or ISO. Many users try the GUI approach: Control Panel
If you are unable to find your installation media and happen to have an internet connection, you can enable it directly through the Windows interface: Windows Key + R appwiz.cpl Turn Windows features on or off on the left sidebar. Check the box for .NET Framework 3.5 (includes .NET 2.0 and 3.0) and let Windows Update download the necessary files. 0x800F081F ) that sometimes occurs during this installation?
Verify the installation by checking the .NET Framework version in the Registry Editor (Regedit.exe) or by running the following command in the Command Prompt:
Restart your computer once the prompt indicates success. Method 3: Using Third-Party Offline Installer Tools Unlike older versions of Windows, the only supported
In some corporate environments, Group Policy blocks local feature installation.
dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Copied to clipboard 4. Wait for Installation to Complete to run the command. You will see a progress bar in the command prompt. Wait until it reaches 100% and displays the message: "The operation completed successfully."