We do not have a download file for the latest version (6.2.1), but you can try downloading it from the developer's site
Download version 2.5.4.0 from Mac Informer
Version: 2.5.4.0
Date update: Jul 31, 2015
File name: devolutions.remotedesktopmanager.free.mac.2.5.4.0.dmg
Size: 64.9 MB