Recent updates seem to have removed the pre-loading effect of data mods, which was very frequently used to use data mods on campaigns and scenario editor:
Also these updates have broken the saved games and replays of modded dataset. The game tries to load them on default dataset (instead of using mod dataset) and crashes with “failed to load game issue”
I find myself having the same request. I’m making a data mod that changes some unit stats and it would be great if I could just click “Test” in the scenario editor to test it. I guess if I were a really serious modder I would replace the main empires2_x2_p1.dat file in the game itself; does that work? I’m kinda scared to even try.