But if you have a game that is in a version prior to OOTP25 and want the OOTP25 game to merely import an OOTP 24 game enroute to migrating to OOTP26, that is possible here:
https://www.ootpdevelopments.com/ootp-prior-version/
But as kq76 states, there are no licenses to activate the OOTP25 game. It is just on the site above as a waypoint so people can get from prior versions forward.