For users on GOG.com , you can use the GOG Galaxy client to select previous versions in the game settings.
Build 38 was a transformative update that focused on expanding the map and refining survival mechanics:
Many veteran players return to Build 38 for nostalgia or to experience the game's evolution. It represents the "pre-vehicle" era (though early vehicle testing began shortly after), where long-distance travel was a grueling on-foot challenge. It is also less demanding on older PCs compared to the animation-heavy Build 41. Project Zomboid | How to Install BUILD 41
You can find the original release notes and developer discussions on the The Indie Stone Blog .
Right-click Project Zomboid in your Library, select Properties , go to the Betas tab, and choose the legacy38 branch from the dropdown menu. Steam will automatically "update" (downgrade) your game to this version.
Introduced the ability to dig graves with a shovel to bury the dead, along with carpentry recipes for wooden crosses and memorials. It also added mechanics where large piles of rotting corpses could make players ill.