Greetings!
To resolve a security issue tied to the way LUA libraries were loaded for mods we released a minor update. This update will not change your version number or cheksum, and save files should be unaffected.
The update has already been applied through Steam.
To prevent IO or system/OS access in Lua (to prevent mods abusing it), we want to disable the `luaopen_io` and `luaopen_os` functions in the LUA library/dll.
These are updated LUA libraries with that functionality disabled. This does not change behavior of the base game, or impact the multiplayer checksum. Some mods might use these libraries for benign purposes, but unfortunately they will not function after this fix.