In order to use mods like arcdps and radial menu you will need to use install directx compiler 47, the the the highest directx 9 version, highest directx 11 version, and dotnet472. Set your game to proton version 8 to install these. The dotnet472 install seems to fail with any other proton version. You should be able to change it to whatever version after you get these DLLs installed.