Playing multiplayer on a non-steam (cracked) version of Project Zomboid is possible, but it requires a bit more setup than the official version since you cannot use Steam’s built-in "Invite to Lobby" or "Join Game" features.
The host starts a local server via the button in the main menu. how to play multiplayer on cracked project zomboid free
To join a friend's multiplayer server, follow these steps: Playing multiplayer on a non-steam (cracked) version of