or insert your installation USB. Note the drive letter (e.g., Command Prompt as an Administrator. Run the following DISM command, replacing with your actual drive letter:
Download the Microsoft .NET Framework 3.5 SP1 (Full Package) . This includes .NET 2.0, 3.0, and 3.5. net framework 2.0 and 3.0 offline installer
Modern Windows versions do not ship with these legacy frameworks enabled by default. They are stored as "Features on Demand" (FOD). If you try to install an old app, Windows will attempt to download the files from Windows Update. This fails if you are offline or if WSUS (Windows Server Update Services) blocks it. Hence, you need the . or insert your installation USB
Elias had spent the last three hours staring at a "Setup Failed" message. This includes
Occurs on Windows 8/10/11. Use Control Panel → Turn Windows features on or off → .NET Framework 3.5 instead.
Even with a perfect offline installer, you may encounter issues. Here are the top 3 problems and their solutions.