This is the most reliable and secure method. You will need an ISO or DVD of the same operating system version.
Run the following command in an elevated Command Prompt. Replace D: with your actual mounted drive letter:
On the page, click the link "Specify an alternate source path" at the bottom.
This article provides a definitive guide to locating, downloading, validating, and deploying the package. This is the most reliable and secure method
Using (Deployment Image Servicing and Management) is the most reliable method, especially if the server is managed by WSUS , which often blocks these specific on-demand downloads. Installing .Net 3.5 on Windows 2012 R2 - Server Fault
Install-WindowsFeature NET-Framework-Features -Source C:\Temp\NetFX3
If you want, I can:
Save as Install-NetFx3.ps1 :
If you manage a Windows Server 2012 R2 environment, you have likely encountered a frustrating circular dependency: a critical legacy application requires .NET Framework 3.5 (which includes 2.0 and 3.0), but your standard installation methods fail. The error message is vague, the official "Add Roles and Features Wizard" prompts you for a source path, and you are left searching for a solution.
Once the .cab file is placed on the target server (e.g., C:\Temp\ ), you have two primary deployment options. Replace D: with your actual mounted drive letter:
DISM is the most effective command-line tool for servicing Windows images and installing packages directly.
Copy this file to a local directory on your server (e.g., C:\NetFx3 ). Method 2: Bypassing WSUS to Download from Windows Update
Installing .NET Framework 3.5 on Windows Server 2012 R2 doesn't have to be a hassle. By understanding the need for the microsoft-windows-netfx3-ondemand-package.cab file and following the steps in this guide, you can get it installed and move on with your work. Installing
Open PowerShell as an administrator.