How Do I Get DDO (Dungeons & Dragons Online) Operational On Windows 10 Desktop?

The Situation:

The game was downloaded and installed normally via Steam. With installation complete, I clicked the "Play" button from the Steam window. The launcher for DDO appears, then performs necessary downloads. When I click to launch the game (regardless of server), the launch window disappears and then...nothing.

Steps Toward a Solution:

• In task manager, I did not find any programs running (after clicking to launch the game) that relate to either DDO or Turbine.
• Rechecking the minimum system requirements, the computer in question is well-above spec.
• I read this question about running on Windows 8.1, but unlike the OP I receive no error messages at all.
• Per this DDO support article, I checked for scheduled downtime - such was not the case.
• Per the same article, I checked the files mentioned therein - everything was correct.
• Continuing to follow suggested troubleshooting, I made sure to launch as an Administrator - still nothing.

In the next room on a different computer, without any special attention or modification, the game launches and runs without the slightest hiccup. As to finding a resolution, I am currently stumped.

Solution 1:

I had the same issue - What fixed it for me is the DirectX web installer from Microsoft Here (automatic download)

Somewhere your DirectX has been corrupted, and this installs multiple dx9 dll files for the multiple versions of DirectX.

After installing this, I went from the same issue to being able to select DX11 as my target environment