How to install Microsoft .NET Framework 3.5.1 on Windows 7

How to repair or reinstall .NET Framework 3.5

FAQ: How do I install .Net Framework

Offline install of .NET Framework 3.5 in Windows 10 using DISM

Server Prerequisites

How to Turn on .Net Framework 3/3.5/4/4.5 Windows 7/8 Features

How to Download and Install .net framework 3.5.1 externally

You must use the Role Management Tool to install or configure Microsoft .NET Framework 3.5.

I CAN'T INSTALL .NET FRAMEWORK ON WINDOWS 7 - Microsoft Community

KB32565: You must use the Role Management Tool to install or configure Microsoft .NET Framework 3.5 error is encountered while installing MicroStrategy 9.x/10.x on a Windows machine.

Unable to install .NET Framework 3.5 on Windows 10 computer; No longer installed by default