Can't install .NET 3.5 on a Windows 10 Enterprise laptop, getting error 0x800F0954

I'm required to install some software on my work laptop. It's running Windows 10 Enterprise. It failed, telling me that I need to have the .NET Framework 3.5 installed. I've tried, unsuccessfully, to install .NET 3.5 both by going to Microsoft's website and also by going through Turn Windows Features on and off. Neither worked. I've looked here on Superuser, but couldn't find anything the discussed error 0x800F0954. Found other errors, but not 0x800F0954, so I don't believe this is a duplicate. Given this, then how to I resolve this problem? Here's a picture of the error:

The following should work.

1. Mount the appropriate Windows 10 Enterprise ISO
2. Open PowerShell as an Administrator
3. Run the following commands:

Add-WindowsCapability -Online -Name NetFx3~~~~ Source D:\Sources\SxS

4. Restart
5. Done

Source: Error 0x800F0954 when installing .NET Framework 3.5