These errors mean Windows cannot find the source files or is blocked from accessing them.
Here, <path_to_source> represents the location of the .NET Framework 3.5 source files, which you can download from Microsoft's official website.
If your computer simply lacks the feature but has a stable internet connection, you do not need to download anything manually.
Copy and paste the following command, replacing D: with your actual drive letter: These errors mean Windows cannot find the source
If you have a Windows 10 or 11 installation USB stick, you already have
The sxs folder must come from the exact same version and build of Windows installed on the target machine. You cannot use a Windows 10 ISO to install .NET 3.5 on Windows 11.
Press . The command prompt will display a progress bar. Once it reaches 100%, you will see the message: "The operation completed successfully." Copy and paste the following command, replacing D:
Dism /online /enable-feature /featurename:NetFx3/All /Source:E:\sources\sxs /LimitAccess Use code with caution. Wait for the operation to complete (it will say and "The operation completed successfully"). Method 2: Using the "dotNetFx35" Offline Installer Tool
This guide is structured to be easy to follow, no matter your technical level. You'll learn:
Do you have the or installation USB available? Share public link The command prompt will display a progress bar
Installing .NET Framework 3.5 offline on Windows 10 or 11 is straightforward once you understand that it's a Windows feature. The key is to use the DISM command-line tool and provide it with a valid source of installation files, either from a dedicated NetFx3.cab file or a Windows installation ISO.
Move the .cab file to a simple path. For this example, let's place it as C:\netfx3.cab .
The remains a critical component for running thousands of legacy Windows desktop applications. While modern operating systems like Windows 10 and Windows 11 come pre-packaged with newer versions like .NET Framework 4.8 or .NET 6/7/8, many older apps, enterprise software, and PC games specifically require version 3.5 (which includes .NET 2.0 and 3.0) to function.
Limited bandwidth environments where downloading repetitive setup files is too costly.
Sometimes, things don't go as planned. Here are solutions to the most common errors.