Talk about the 23 to 24 process. You had OOTP24 installed. When to the Start Screen. Selected Import OOTP23 Game, selected the league, selected the world.dat file, named the file, and then watched lots of loading at the top of the OOTP24 start screen as things imported into 24 and then the game opened. You saved it and exited. Then, with a saved OOTP24 game, you closed OOTP24 and opened OOTP25. From the OOTP25 start screen, you went to Import OOTP24 game, got to the saved games folder of OOTP24 and selected the .lg for the one you'd just moved over to OOTP24, selected the world.dat folder, and advanced the same way, watching things load and into OOTP25? Any steps in there that did not happen?
btw Here is the manual describing the process (it's the same from 24 25 as from 23 to 25).
https://manuals.ootpdevelopments.com...ting_old_games