b42 save file singleplayer -> multiplayer migration issue | Project Zomboid | Page 1

maiden relic Mar 21, 2026, 2:48 PM

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with the security vulnerability discovered in old b42 builds of pz, have anybody else not been able to migrate (using the in-game tool) their single-player b42 save file to build 42 multiplayer when the build 42 singleplayer build was removed from steam? when i try, i get a corrupted . i am using some mods.

simple flower Mar 21, 2026, 9:05 PM

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What in-game tool are you referring to?

maiden relic Mar 21, 2026, 9:42 PM

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If you played PZ on build 42 before they added multiplayer, and update zomboid to the version where they added multiplayer, you would be promptef to "convert save" from a single player b42 save to a multiplayer b42 save

simple flower Mar 22, 2026, 4:04 PM

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That does not convert a SP save to Multiplayer, it just tries to convert any save from an older version to the newer version

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If I understand you correctly, you are trying to convert the 42.12 version to 42.15? That conversion is not possible

#b42 save file singleplayer -> multiplayer migration issue