dude, you are making this hard for yourself.
download the client from github. it's the compiled version and it contains the ICE adapter too.
https://github.com/FAForever/downlords- ... RC1.tar.gz
we cannot help you with java build errors, why the ICE adapter doesn't compile and stuff. btw they have a video on github about how you can compile the project.
https://www.youtube.com/watch?v=_kJoRehdBcM
btw Proton 4.11 works for me.
do you have an AMD Vega card maybe?
https://wiki.faforever.com/index.php?ti ... n_is_black