To download the free Microsoft .NET Framework, navigate to the Microsoft website, click Products in the menu bar at the top of the page, select For developers & IT pros, and select Visual Studio. On the Visual Studios page, click Downloads at the top of the page and click All Downloads. Click .NET Framework at the left-hand side of the Visual Studios Downloads page.
As of December 2015, the Visual Studios Downloads page offers four versions of .NET Framework, including 4.6.1, 4.6, 4.5.1 and 4.5.1 Developer Pack, for downloading. The framework and the language pack are available for each version. Click the link of a .NET Framework version on the left sidebar and click the Download button under a software to start downloading.
The default download format is the Web Installer. When executed, this small package determines the platform of a computer and downloads only components applicable for that platform. Alternatively, choose the EXE format to download the executable version of the .NET Framework.
To download older versions of the Microsoft .NET Framework, navigate to the Microsoft website, click Products at the top of the page, select For developers & IT pros, and select MSDN. Once there, click Visual Studios in the Dev centers section at the bottom left of the page. On the Visual Studios page, click .NET Framework and .NET SDKs in the Downloads section on the right-hand side of the page and click More .NET Framework downloads.