The LAN fix is a or DLL replacement that modifies game behavior, not a cracked copy. If you own a legitimate Steam version, using it for local play is generally considered fair use for preservation. However, antivirus software may flag the patched DLL (false positive due to code injection). Always download from trusted community sources.
Have a different LAN issue with Resident Evil 6? Found a newer fix? Join the discussion on the Steam Community Hub or the RE6 Modding Discord. resident evil 6 lan fix