The specific file required is typically named microsoft-windows-netfx3-ondemand-package.cab . You can find it by:
Manually specify the CAB file as the installation source using the Deployment Image Servicing and Management (DISM) tool.
You do not need third-party tools. The native Windows tool DISM (Deployment Imaging Service and Management Tool) handles everything.
How to Install .NET Framework 3.5 Offline Using a CAB File If you’ve ever tried to run an older app or game on Windows 10 or 11, you’ve likely hit the "The following feature couldn't be installed: .NET Framework 3.5" error. While Windows usually downloads this automatically, restricted environments or slow internet can make it a headache. The most reliable fix is an offline installation using the .CAB file found on your original Windows installation media. Step 1: Locate Your CAB File
