We do not have a download file for the latest version (7.3.1), but you can try downloading it from the developer's site
Download version 7.2 from the developer's website
Version: 7.2
Date update: May 26, 2015
File name: zdesktop_7_2_3_ga_b11971_20130711014052_macos_intel.dmg
Size: 74 MB