To install .NET Framework 3.5 offline on Windows 10 or 11, you must use the original installation media (ISO, DVD, or USB) because the files are located in the \sources\sxs folder. Direct Installation via Command Prompt (Recommended) your Windows installation media (ISO or USB). Note the Drive Letter (e.g., D: ). Open Command Prompt as Administrator.
If you have the installation media for Windows Vista or later, you can use it to install .NET Framework 3.5 offline. Follow these steps: net framework 3.5 offline install
Have a different error code? Drop a comment below or check our [DISM Error Code Cheat Sheet]. To install