This issue was still not completely fixed. "Steam Installer" disappeared from GNOME Software after latest Steam update, see: https://bugs.launchpad.net/ubuntu/+source/steam/+bug/1864635
This issue was still not completely fixed. "Steam Installer" disappeared from GNOME Software after latest Steam update, see: https:/ /bugs.launchpad .net/ubuntu/ +source/ steam/+ bug/1864635