Main menu widget 4.9 broken

hello i am currently doing a project for college i updated my project from 4.8 to 4.9 now my issue is that when packaged the project wont open levels from the main menu widget. however in 4.8 it does open the levels… now my question is. is it possible and how would i convert the project project that is in engine 4.9 to engine 4.8?