To make sure I'm giving you the right help, could you clarify what you need? For example,

for the co-op/multiplayer features within that specific version?

and how to set up a legitimate co-op server on the current version?

It sounds like you might be looking for information about a specific "free" version of featuring co-op play.

Project Zomboid Free Download (v41.78.12 Co-op) -

To make sure I'm giving you the right help, could you clarify what you need? For example,

for the co-op/multiplayer features within that specific version? Project Zomboid Free Download (v41.78.12 Co-op)

and how to set up a legitimate co-op server on the current version? To make sure I'm giving you the right

It sounds like you might be looking for information about a specific "free" version of featuring co-op play. Project Zomboid Free Download (v41.78.12 Co-op)