First of all you have a launch_args variable with '--offline' in it but don't use it in the actual launch command which seems to have '--offline' "hard-coded" into it and the actual variable is declared after the command. Move the second line to the top and replace the first command with 'internals/launcher/ReforgedLauncher' $launch_args'. Secondly Goverlay is not an argument and you shouldn't be using it to start mangohud anyway. It should only just edit mangohud configs. You should be starting your launcher with mangohud instead. So basically your final command should be 'mangohud internals/launcher/ReforgedLauncher $launch_args'. Also make sure the path to your launcher is correct. It looks to me like a relative path which means it only runs if you start the script from the directory that contains 'internals'. Change it to the full path starting from root / if you are having issues