MafiaCoop 0.17.1 (pre-release, checked on one PC, not yet tested on two PCs)

Pre-release. Checked on one PC with two copies of the game, not yet tested on two PCs. 0.17.1 fixes the bugs found in 0.17.0, most importantly one that could overwrite the host's story save. Anyone on 0.17.0 should update.

Download MafiaCoop-0.17.1.zip, extract it anywhere (not into the game folder) and run MafiaCoop.exe. The zip's README.txt covers requirements, hosting and joining, settings, the optional start-from-Steam mode and uninstalling. MafiaCoop-0.17.1-symbols.zip holds the PDBs and is only needed to read crash dumps. Both players need 0.17.1: it can't play with 0.17.0. A player on another version is turned away with a "version mismatch ... Both players need the same MafiaCoop version" message.

Requirements

• Windows 10/11, 64-bit
• Mafia: Definitive Edition that you own on Steam, Steam build 16502642 (the current one), with Steam running
• Everyone in a session on 0.17.1. Joining by IP needs UDP port 27960 open on the host.

Fixed in 0.17.1

• Your story save is safe again. In 0.17.0, when the host of a co-op Free Ride died, the game wrote over his real story save. 0.17.1 fixes this. If you hosted Free Ride in 0.17.0 and died, check your story progress. Backing up Documents\My Games\Mafia Definitive Edition before playing a pre-release is still a good idea.
• Motorbikes: the other player's character no longer keeps falling off and getting back on the bike, over and over, for the whole ride. After getting off, his character no longer stands on top of the parked bike.
• Traffic: the copies of the host's moving cars now stay in their lane instead of drifting up to 2 m to the side.
• The CO-OP entry in the main menu was missing in about one start in three. Now it is there every time.
• Getting in and out of cars:
  • The other player's character no longer stays stuck in a car after he has got out.
  • Getting into a back seat no longer throws the character straight back out.
  • Riding along in someone else's car now shows you in that car.
  • Getting into a new car right after leaving your old one no longer mixes the two cars up.
• Car damage: a crashed car no longer flips between repaired and damaged on the other player's screen.
• The leash: a friend pulled back to the host in a car no longer falls through the street.
• Police: a friend's game no longer shows a police car of its own that the host doesn't have.
• Rejoining: coming back into a session no longer waits 15 seconds for a car that had already gone.

Checked on one PC (two copies of the game)

• Free Ride together on foot, driving together, riding along in both seats both ways, the motorbike, the leash in a car, a friend downed far away, leaving and rejoining, and a crime near the host. The final build passed every automatic sync check; the longer scenarios passed apart from a few borderline numbers.
• The start of CHAPTER 2: TAXI together (up to the taxi stand).
• No save or profile file changed.

Known issues

• Not tested on two PCs yet: all of 0.17.x. Steam, real internet latency and two different PCs have not been tried with it.
• Please send your logs: after playing, both players send the newest zip from the logs\bundles folder next to MafiaCoop.exe, or the ...-recovered.zip after a crash.
• Motorbike: when the game keeps throwing the rider's character off the bike on the other player's screen, it is put on the saddle and kept there for the rest of the ride.
• A character sitting in a car's front or driver seat is occasionally thrown out of it on the other player's screen.
• Once in testing, the host's world reloaded after he got into a taxi.
• After rejoining, the lobby shows READY instead of JOIN GAME for a few seconds.
• A player sitting in a car can't be shot by the other players, not even through an open window.
• Parked cars, trams and boats are still each game's own.
• Not reached in any test yet: JOIN FRIEND between two PCs, chapters on two PCs, reconnecting over Steam, doors, picking up items, grenades, three or four players.

Full details: CHANGELOG.md. Core: v0.14.1 (changes).