Delete the download. Go get Shotcut or OpenShot . They are truly free, safe, and will actually export an MP4 file that plays on your phone.
While the software itself might have been decent in 2008, downloading version 6.0 for free today is a high-risk activity with low reward. The security risks from third-party download wrappers are significant, and the software cannot edit modern video files without converting them first (which defeats the purpose).