I have this issue as well. However if I login with another user account on my PC and start a new world, it doesn't complain about a missing legacy.json, although it doesn't exist. Is it possible, that it's only required for worlds created with older versions of the game? Anyway: Wouldn't it be possible to put a legacy.json as an attachment to this case, so anyone who is missing it can download it?
I have this issue as well. However if I login with another user account on my PC and start a new world, it doesn't complain about a missing legacy.json, although it doesn't exist. Is it possible, that it's only required for worlds created with older versions of the game?
Anyway: Wouldn't it be possible to put a legacy.json as an attachment to this case, so anyone who is missing it can download it?