Good news, everyone!
Just released a new version of our Mac client. This version will be compatible with Mac OS X 10.7.5 to 10.12, and works fine with Sierra.
You can grab it over here: BolehVPN GUI v2.0.1
If you have the Mac client already installed, please uninstall it and reboot your system before downloading and installing this new version.
For any other details about the Mac install process, do check out our Mac installation guide!