DMG issues on latest macOS build

[skellock]

I downloaded Nidium_frontend_20170421_084756_a4fcc102904ad0d3f2004c053df455d07dd572b6_Darwin_x86-64.dmg from https://www.nidium.com/downloads/ (2017-04-21 @ 00:12:20), but when i tried to open it

Thank! Project looks interesting, I'd love to take it for a test drive.