If you’re seeing a “.Net Framework 3.5 Is Not Installed” error when trying to install Studio 5000, follow these simple steps to get it installed:


Step 01) Start by opening Windows Control Panel:

Step 02) Next open Programs and Features:

Step 03) Then click on Turn Windows features on or off

Step 04) When the popup window loads, find and select .Net Framework 3.5:

Step 05) Next click on OK :

Step 06) If you’re prompted to download the files from Windows update do so:

NOTE: If your installation download hangs, check out the offline installer we discuss at the end of this article.

Step 07) And when the download and installation is complete, click on Close:

Step 08) Now you should have no issues installing Studio 5000 due to .Net 3.5:

If you’d like to watch a video of the above procedure, check out Episode 29 of The Automation Minute Season 4, below:

Offline Installer:

If for some reason the files never download, or if your PC is not connected to the internet and/or you don’t have access to your Windows 10 Installation DVD, there is another way to install .Net 3.5.

While Microsoft doesn’t provide a “true” offline installation file for .NET 3.5 SP1, a kind soul in the community has made one available, and below I’ll show you how to download and use it:

Step A) Start by downloading the .Net Framework 3.5 offline Installer from https://sourceforge.net/projects/framework-3-offline/

Step B) Then unzip the download, open the folder, and run the utility. When the installer appears, just click on “Start Installation”:

Note: To monitor the progress of the install, open the .txt file in the program’s folder (to refresh the progress, close and reopen the text file.)

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And if you’d like to share your thoughts, opinions, or questions on this article you can do so by clicking on the “post a comment or question” link below.

Until next time, Peace ✌️ 

Shawn M Tierney
Technology Enthusiast & Content Creator

Have a question? Join my community of automation professionals and take part in the discussion! You'll also find my PLC, HMI, and SCADA courses at TheAutomationSchool.com.

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Shawn Tierney



  1. Hi Shawn, I’m having a problem when I try to open RSlogix 5000 shows this message: “RSlogix 5000 is unable to load a dependency that relies on Microsof .NET. Please verify that your .NET security settings do not restrict RSLogix 5000 .NET assemblies from executing.”

    I dont find where to set security settings for .NET app. Can you help me please?

    • Hey Melvis,

      I’ve never run into that, and I’m not finding it on the Knowbase, so I’d recommend asking your local Rockwell Rep or Rockwell Tech Support.

      PS – If you do solve it, please don’t hesitate to share the answer



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