1.) Start JJ2.
2.) Go to the main menu.
3.) Start Project Controller 4 (PC4).
4.) Click on tools.
5.) Click on version editor.
6.) Select 1.24 - TSF Full (1.24) on the drop-down list.
7.) Click change!.
8.) You should be able to join TSF servers now. The sprites will be messed up, though.