If it is not present, it is possible to compile one from GNU's page, which also includes the instruction manual and commands that can be copied & pasted. The Feral Launcher requires libidn version 1.33 in order to work outside Steam Runtime mode, check if the Linux distribution has it in their repository, normally it would include the version number or a compat highlight, sometimes even both (Such as libidn-133-compat in ArchLinux's/ArchLinux based distro's AUR). Game won't run in Steam Native mode (Linux)
Auto-saves will continue to go to your Documents folder. Go into Properties of the 'remote' folder, open the Security tab and deny write access for all groups/user names.
Prevent the game from saving to the Steam save data location.