How to install nightly on Linux?

Trying to get Crimson Desert running but DX12 games currently only work in nightly build. How does one install nightly?

I used this script to install Reshade on Linux:
github.com/kevinlekiller/reshade-steam-proton

Then you should have a folder like:
/home/username/.local/share/reshade/reshade/6.7.3_Addon/
in there will be Reshade64.dll, ReShade32.dll, etc.

Replace the DLLs with the ones from the nightly build.