The .NET Framework 3.5 is a critical runtime requirement for legacy applications and games built between 2005 and 2011. While Windows 10 comes with .NET Framework 4.x pre-installed, it does natively support apps designed for versions 1.1 through 3.5.
If you have a Windows 10 ISO or USB drive, follow these steps to install the framework without using any data:
: Press the Windows Key , type cmd , right-click it, and select Run as Administrator .
: Type the following command, replacing D: with your actual drive letter: