Tried opening my project today after three days and I'm getting a "DX12 is not supported on your system. Try running without the -dx12 or -d3d12 command line argument"

General Feedback & Requests
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1

Self-explanatory. I’ve read online that it could be due to some of the marketplace assets that I’ve downloaded or a plugin I’ve enabled in the editor, though it didn’t give me this issue before and everything was working fine.

Now I have Windows 8.1, which I’m aware only supports DX 11.2 and I’ve kept knowingly using it since 2013 as I didn’t want to update to the spyware that is Windows 10. So a few questions:

  1. Is there any reason why the project worked three days ago (and the last year and a half) and never gave me this message before?

  2. Is this due to a recent Epic Games Launcher Update? If so I’ll happily downgrade.

  3. Is there anyway to bypass DX 12 for this project and remove the offending plugins?

Thanks.

2

Figured it out. Go to your “Unreal Projects” folder then “The name of your project folder” then Config. Open the “DefaultEngine.ini” file and on the line that says:

[/Script/WindowsTargetPlatform.WindowsTargetSettings]
DefaultGraphicsRHI=DefaultGraphicsRHI_DX12

Change “DX12” TO “DX11”

It should open now.

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