"Install Roles and Features" → Specify .NET 3.5 → Source path points to CAB folder.
Ensure NetFx3 is written exactly as above. Alternative: Online Installation
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dism /online /add-package /packagepath:"C:\cab\microsoft-windows-netfx3-ondemand-package~31bf3856ad364e35~amd64~~.cab" Use code with caution.
/enable-feature /featurename:NetFx3 : Enables the .NET Framework 3.5 feature. /All : Enables all parent features of NetFx3.
Ensure you can access the \sources\sxs folder. Open Command Prompt as Administrator: