Almost Human has issued an update for Legend of Grimrock 2 that fixes multiple issues, including some crash bugs, so itís recommended that everybody updates to the latest version. This is a patch for the standalone version of the game - the Steam version should automatically update soon.
GOG version: The patch also works with GOG installations. When a dialog appears saying that an existing installation can not be found and the patcher asks "Abort Installation?", select No. You have to then navigate to the installation location of your GOG version of Legend of Grimrock 2. Legend of Grimrock 2 v2.1.13 Patch