Here is a full guide fromMiniToolfocusing on how to fix GTA V Enhanced ERR_GFX_D3D_NOD3D12 no DirectX 12 adapter.
However, there are many complaints about the common issue in communities GTA V Enhanced ERR_GFX_D3D_NOD3D12.
yo install latest DirectX runtime or install a compatible DirectX 12 video card.

From the message, you find this error is in connection with the DirectX.
Given that, we find several solutions regarding it.
Step 2: After openingDirectX Diagnostic Tool, go toSystem > System Informationand view the version inDirectX Version.

Step 3: DownloadDirectX End-User Runtime Web Installerfrom Microsoft.
Step 4: Run thedxwebsetup.exefile.
Step 5: Launch GTA 5 Enhanced and it wont pop up ERR_GFX_D3D_NOD3D12.
Step 2: Right-tap on the options file and open it with Notepad.
Step 4: Scroll down to theVideoCardDescriptionitem, replace the graphics card with yours, and save the change.
Delete the existing prefs file and paste the new file to the original place.
So, take these steps:
Step 1: In options, go toSystem > Optional features.
Step 2: On Windows 11, clickView featuresfromAdd an optional feature.
On Windows 10, clickAdd a feature.
Step 3: TypeGraphics Toolsinto the search box and tick the box of this feature.
Step 4: Install it.
Then, launch GTA 5 Enhanced to test whether ERR_GFX_D3D_NOD3D12 no DirectX adapter disappears.
Many users have successfully fixed the issue by launching the game in DirectX 11.
On Epic Games Launcher, clickthree dotsnext toGTA > Manageand choose thefolderwith the lens icon next toUninstall.
On Rockstar Games Launcher, go toGTA > options > Open.
Step 3: Copy and paste the downloadedd3d12.dllfile to the directory.
Step 4: Run your game again and no DirectX adapter or runtime found error wont appear.