.NET Framework free

The .NET Framework version redistributable package includes everything you need to run applications developed using the .NET Framework.
If you're looking to run a specific application that requires the .NET Framework, be sure to read its requirements carefully. There are multiple versions of the .NET Framework, and the application may only run on one of them.

.NET Framework Version 1.1  .NET Framework Version 2.0 SP1  .NET Framework Version 3.5 SP1  .NET Framework Version 4.5