/LimitAccess : Prevents DISM from trying to contact Windows Update.

The download hit 45%. An eternity passed.

Navigate to: D:\sources\sxs\

: If you have a Windows ISO or USB, you can use the files located in the \sources\sxs folder as a source for the DISM command instead of a standalone .cab file. Important Considerations

You click "Download and install this feature," wait 10 minutes, and are greeted by (or 0x800F081F). This is incredibly frustrating, especially on corporate laptops or systems with WSUS (Windows Server Update Services) policies.

dism /online /add-package /packagepath:C:\temp\netfx3.cab