My program says Microsoft DotNet is required. How do I install it?

Updated by Bryan Jones


This document covers adding .NET Framework (DotNet) features to your Windows installation. While Telos cannot provide desktop support for your Windows computers, we are providing this document with the hope that it will be useful to you.


There are many several versions of the .NET Framework. Which versions you have depends mainly on what operating system you have. As of this writing, if you have a modern Windows 10 computer with recent updates, you will likely have .NET Framework 4.8 as a default. However, many programs still require support for previous which are typically not enabled by default.


.NET Framework is enabled/disabled from the Program and Features application in Control Panel.

Do not try to download .NET Framework and install it separately
  1. Open Windows Control Panel
  2. Double click Programs and Features

If your Control Panel is in Category View, you can Programs

  1. Click Turn Windows Features on or off
  2. When the Windows Features box opens, check the box next to .NET Framework 3.5 (includes .NET 2.0 and 3.0)

  1. Click OK
  2. Once complete, click Close

Windows usually requires internet access to download the necessary files and complete the process. If asked, choose the option to allow Windows to download the files for you.
If you have problems during this process, please get in touch with your local IT staff for assistance. There could be permissions issues or other local controls that prevent this update. Telos will not be able to assist you with this.
  1. Once the process is complete, try to install your program again.

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