The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@uveso Alright thanks to that the client loads it but the mod itself is not working, it should change some of the campaign maps but seems it's not doing anything, guess its not implementing the map, mohodata and lua changes when it loads the campaign mission.
Thanks for the help tho