Guides / .NET 3.5 Framework

.NET 3.5 Framework

Integrate .NET 3.5 into images or install it on already deployed systems.

.NET Framework 3.5 is required by many applications but is not enabled by default in modern Windows. This guide covers two scenarios: integrating it into an image before deployment, and installing it on an already running system.

Integrate .NET 3.5 into an Image

To offline integrate .NET Framework 3.5 into a Windows 10/11 image:

  1. Load an image - use full ISO content extracted to a folder
  2. Go to the Updates page
  3. Click Add → Templates → .NET 3.5 Framework
  4. Go to Apply → Process

Note:NTLite automatically pulls the needed .NET 3.5 package from the loaded image's source files. No separate download is required.

Install .NET 3.5 on a Deployed System

To install .NET 3.5 on an already deployed Windows system using NTLite:

  1. On the Start page, go to toolbar Tools → Install Updates
  2. Click Add → File
  3. Select the .NET 3.5 CAB from the ISO that matches your deployment: .\sources\sxs\microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab
  4. Go to Apply → Process

Important: The ISO must match the Windows version and build number of the deployed system. For 32-bit systems, use the x86 variant of the CAB file instead of amd64.

Power Plan IntegrationDisk Partitioning