Saw it - ended up at the github to see there is no build system.
It will be uploaded soon, im pretty confident in Johns capabilities as a dev so I didn't mind.
Also he has fully proven his ability to code so far.
Not concerned about his ability to code - more concerned that there isn't any solid proof the binaries were built from the source on the github.
Anyway, looking past that, the Linux x64 binary has a daemon, not a GUI. Is there instructions on how to interact with this?
Try to reach John directly with this question: BM-NC49AxAjcqVcF5jNPu85Rb8MJ2d9JqZt is his bitmessage. Hes away now for a day though, wrote family issues, but he watches that pretty often.