We do not have a download file for the latest version (4.8), but you can try downloading it from the developer's site
Download version 2.7.0 from Mac Informer
Version: 2.7.0
Date update: Jul 27, 2017
File name: bitnami-dreamfactory-2.7.0-1-osx-x86_64-installer.dmg
Size: 144 MB