Once you have your local copy compiled, locate the UE4Editor.exe at windows explorer (usually inside …\Engine\Binaries\Win64) right-click on it and choose “Create Shortcut”. Now right-click at the shortcut created and choose Properties. Once you have the properties windows opened and inside the field Target add to the text “-dx12 -raytracing” so in the end it will be like: “…\Binaries\Win64\UE4Editor.exe” -dx12 -raytracing" being the “…” the place your original UE4Editor is located. Make sure to have a space before each “-”