How to install .NET Framework 3.5 SP1 into Visual Studio 2017

You should install the .NET 3.5 development tools using the Visual Studio Installer.

Instructions:

  1. Close Visual Studio (the next step will close it for you, but it's better to close it yourself so you are in a known state).
  2. Open the Visual Studio Installer (search for it in the Start menu).
  3. Choose to modify the installation you desire.
  4. Go to the "Individual Components" tab.
  5. Under the ".NET" section choose ".NET Framework 3.5 Developer Tools".
  6. Click "Modify" in the bottom right corner to apply the changes.

You may also need to turn on the Windows Feature .Net Framework 3.5 (includes .NET 2.0 and 3.0).


I had the same issue. Go to Windows Control panel over there add features to windows. Then check .NET framework 3.5. Done! https://improveandrepeat.com/2018/07/an-alternative-way-to-install-net-3-5-on-windows-10/

(you should also check if you already haven't ".NET 3.5 development tools" using the Visual Studio Installer.)