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Microsoft Surface Pro 3 with Windows 8.1 Enterprise can't install .NET 3.5

I need to enable the .NET 3.5 Windows feature in order to run a program that we use, but Windows continually bombs out when attempting to reach Windows Update Server in the process.

Things I've already tried...
I have excellent Internet connectivity
I've tried Offline Installer method with the Win 8.1 Enterprise DVD.
I've Tried Editing the Group Policy Settings to force it to install from the DVD
I've tried modifying the Registry to not use Windows Update
I've tried Powershell dism command to pull it from the DVD

Nothing seems to work.  I get an Access denied error and the dism log isn't helping me any when I scroll through it
Windows 8Microsoft 365 Enterprise

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8/22/2022 - Mon