When you delete (uninstall) KineMaster and reinstall it, all your KineMaster 5.0 projects will be deleted, too.

To keep KineMaster projects, you must back up the projects you want using Export Project (KineMaster >> My Projects >> See All >> Select a project >> More(…) >> Export Project).

After reinstalling KineMaster, you can restore the backed up projects tapping Create New to enter New Project screen, and using the Import Project button (KineMaster >> Create New >> Import Project).