over 4 years ago - Tunnel King - Direct link
1.4 is a major update of the game. Part of this update involves a significant change to world and player file save formats that will not be backward compatible with earlier versions of the game.

Once you load an existing world or character into 1.4, you will not be able to use those worlds/players in "older" versions any longer UNLESS you made backup copies.
  • Existing world/player files should load seamlessly into 1.4. While every effort has been made and extensive...

1.4 PSA: Back up your data now.