Here is the definitive method to install .NET Framework 3.5 from a CAB file using DISM.
For enterprise administrators, the CAB file is included in the Volume License versions of Windows. cab file for .net framework 3.5
You can download the standalone CAB from the Microsoft Update Catalog, but be extremely careful to match your exact Windows version (build number, architecture: x64 vs x86). Here is the definitive method to install
When you tick .NET Framework 3.5 (includes 2.0 and 3.0) in the GUI, Windows looks for the source files. If it doesn't find them locally, it calls out to Microsoft servers. If your WSUS server doesn't have the feature, or if the user lacks admin rights to Windows Update, the installation will error out with code 0x800F0906 or 0x800F081F. (Optional) Generate an INF or setup script (install
The CAB method bypasses all of this.
Assumption: You have the full redistributable files and any updates/language packs in a folder.
Silent install example for dotnetfx35:
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