For version 3.5, you often don't need to download anything manually: Open the and go to Programs and Features .

Check the box for and click OK . Windows Update will automatically handle the rest.

Choose between the (to run existing apps) or the Developer Pack (to create apps).

To download and install Microsoft .NET Framework, you can use the official Microsoft .NET Download Page to find the specific version required by your software. Step 1: Identify the Required Version

Most recent applications use .NET Framework 4.8.1 or 4.8 .