Fix Lords of the Fallen Error DX12 Is Not Supported On Your System Try Running Without -dx12/-d3d12

Fix Lords of the Fallen Error DX12 is not supported on your system. Try running without the -dx12 or-d3d12 command line argument
Step 1) Make sure your graphics card/System is supported to play the game
Step 2) Restart PC
Step 3) Remove any entry from the launch options in Steam
Step 4) Update Windows
Use Media Creation Tool to Update Windows 11/10
https://www.microsoft.com/en-in/software-download/windows10
https://www.microsoft.com/en-in/software-download/windows11
Install DirectX: https://www.microsoft.com/en-us/download/details.aspx?id35
Step 5) Make sure Discrete Graphics card is enabled in Device Manager
Step 6) Desktop Users make sure monitor’s display cable (HDMI/DP/DVI Cable) is connected to the graphics card slot instead of motherboard slot
Step 7) Do a clean installation of Graphics card driver
https://www.nvidia.com/en-us/geforce/drivers/
https://www.amd.com/en/support
Step 8) Laptop users with dual graphics card: Run the game on dedicated graphics card
Step 9) Run the game from the game installation folder, try running as an administrator, disable full screen optimization, try compatibility mode.
Step 10) Verify the game files
Step 11) Update the System BIOS
Step 12) Close all the overclocking Apps & remove the undervolt
Step 13) Move the game to SSD, make sure your SSD has enough space
Step 14) Uninstall the game, delete the game files, restart your PC and reinstall the game to C Drive (SSD Drive)